]> gitweb.stoutner.com Git - PrivacyBrowserAndroid.git/blobdiff - app/src/main/java/com/stoutner/privacybrowser/activities/MainWebViewActivity.kt
Update the stored favorite icon when navigating history. https://redmine.stoutner...
[PrivacyBrowserAndroid.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebViewActivity.kt
index d56d9b71727e49b92ac1f3ebc4edb3594ab0fd86..5036e86a490a89cae3698e86e7942157e3ff29e4 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2023 Soren Stoutner <soren@stoutner.com>.
+ * Copyright 2015-2024 Soren Stoutner <soren@stoutner.com>.
  *
  * Download cookie code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
  *
@@ -76,7 +76,6 @@ import android.webkit.WebSettings
 import android.webkit.WebStorage
 import android.webkit.WebView
 import android.webkit.WebViewClient
-import android.webkit.WebViewDatabase
 import android.widget.AdapterView
 import android.widget.ArrayAdapter
 import android.widget.CheckBox
@@ -87,25 +86,28 @@ import android.widget.LinearLayout
 import android.widget.ListView
 import android.widget.ProgressBar
 import android.widget.RadioButton
+import android.widget.RadioGroup
 import android.widget.RelativeLayout
 import android.widget.TextView
 
 import androidx.activity.OnBackPressedCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.ActionBar
-import androidx.appcompat.app.ActionBarDrawerToggle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.appcompat.content.res.AppCompatResources
 import androidx.appcompat.widget.Toolbar
 import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.content.ContextCompat
 import androidx.core.view.GravityCompat
 import androidx.cursoradapter.widget.CursorAdapter
 import androidx.drawerlayout.widget.DrawerLayout
 import androidx.fragment.app.DialogFragment
 import androidx.preference.PreferenceManager
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
-import androidx.viewpager.widget.ViewPager
+import androidx.viewpager2.widget.ViewPager2
 import androidx.webkit.WebSettingsCompat
 import androidx.webkit.WebViewFeature
 
@@ -116,9 +118,9 @@ import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.tabs.TabLayout
 
 import com.stoutner.privacybrowser.R
-import com.stoutner.privacybrowser.adapters.WebViewPagerAdapter
+import com.stoutner.privacybrowser.adapters.WebViewStateAdapter
 import com.stoutner.privacybrowser.coroutines.GetHostIpAddressesCoroutine
-import com.stoutner.privacybrowser.coroutines.PopulateBlocklistsCoroutine
+import com.stoutner.privacybrowser.coroutines.PopulateFilterListsCoroutine
 import com.stoutner.privacybrowser.coroutines.PrepareSaveDialogCoroutine
 import com.stoutner.privacybrowser.coroutines.SaveUrlCoroutine
 import com.stoutner.privacybrowser.coroutines.SaveWebpageImageCoroutine
@@ -137,8 +139,46 @@ import com.stoutner.privacybrowser.dialogs.UrlHistoryDialog
 import com.stoutner.privacybrowser.dialogs.ViewSslCertificateDialog
 import com.stoutner.privacybrowser.dialogs.WaitingForProxyDialog
 import com.stoutner.privacybrowser.fragments.WebViewTabFragment
-import com.stoutner.privacybrowser.helpers.BlocklistHelper
+import com.stoutner.privacybrowser.helpers.BOOKMARK_NAME
+import com.stoutner.privacybrowser.helpers.BOOKMARK_URL
+import com.stoutner.privacybrowser.helpers.COOKIES
+import com.stoutner.privacybrowser.helpers.DARK_THEME
+import com.stoutner.privacybrowser.helpers.DISABLED
+import com.stoutner.privacybrowser.helpers.DISPLAY_IMAGES
+import com.stoutner.privacybrowser.helpers.DOMAIN_NAME
+import com.stoutner.privacybrowser.helpers.ENABLE_DOM_STORAGE
+import com.stoutner.privacybrowser.helpers.ENABLE_EASYLIST
+import com.stoutner.privacybrowser.helpers.ENABLE_EASYPRIVACY
+import com.stoutner.privacybrowser.helpers.ENABLE_FANBOYS_ANNOYANCE_LIST
+import com.stoutner.privacybrowser.helpers.ENABLE_FANBOYS_SOCIAL_BLOCKING_LIST
+import com.stoutner.privacybrowser.helpers.ENABLE_JAVASCRIPT
+import com.stoutner.privacybrowser.helpers.ENABLE_ULTRAPRIVACY
+import com.stoutner.privacybrowser.helpers.ENABLED
+import com.stoutner.privacybrowser.helpers.FAVORITE_ICON
+import com.stoutner.privacybrowser.helpers.FOLDER_ID
+import com.stoutner.privacybrowser.helpers.FONT_SIZE
+import com.stoutner.privacybrowser.helpers.ID
+import com.stoutner.privacybrowser.helpers.IP_ADDRESSES
+import com.stoutner.privacybrowser.helpers.IS_FOLDER
+import com.stoutner.privacybrowser.helpers.LIGHT_THEME
+import com.stoutner.privacybrowser.helpers.PINNED_IP_ADDRESSES
+import com.stoutner.privacybrowser.helpers.PINNED_SSL_CERTIFICATE
+import com.stoutner.privacybrowser.helpers.REQUEST_ALLOWED
+import com.stoutner.privacybrowser.helpers.REQUEST_BLOCKED
+import com.stoutner.privacybrowser.helpers.REQUEST_DEFAULT
+import com.stoutner.privacybrowser.helpers.REQUEST_THIRD_PARTY
+import com.stoutner.privacybrowser.helpers.SSL_ISSUED_BY_COMMON_NAME
+import com.stoutner.privacybrowser.helpers.SSL_ISSUED_BY_ORGANIZATION
+import com.stoutner.privacybrowser.helpers.SSL_ISSUED_BY_ORGANIZATIONAL_UNIT
+import com.stoutner.privacybrowser.helpers.SSL_ISSUED_TO_COMMON_NAME
+import com.stoutner.privacybrowser.helpers.SSL_ISSUED_TO_ORGANIZATION
+import com.stoutner.privacybrowser.helpers.SSL_ISSUED_TO_ORGANIZATIONAL_UNIT
+import com.stoutner.privacybrowser.helpers.SWIPE_TO_REFRESH
+import com.stoutner.privacybrowser.helpers.SYSTEM_DEFAULT
+import com.stoutner.privacybrowser.helpers.WEBVIEW_THEME
+import com.stoutner.privacybrowser.helpers.WIDE_VIEWPORT
 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper
+import com.stoutner.privacybrowser.helpers.CheckFilterListHelper
 import com.stoutner.privacybrowser.helpers.DomainsDatabaseHelper
 import com.stoutner.privacybrowser.helpers.ProxyHelper
 import com.stoutner.privacybrowser.helpers.SanitizeUrlHelper
@@ -149,7 +189,6 @@ import com.stoutner.privacybrowser.views.EASYPRIVACY
 import com.stoutner.privacybrowser.views.FANBOYS_ANNOYANCE_LIST
 import com.stoutner.privacybrowser.views.FANBOYS_SOCIAL_BLOCKING_LIST
 import com.stoutner.privacybrowser.views.THIRD_PARTY_REQUESTS
-import com.stoutner.privacybrowser.views.ULTRALIST
 import com.stoutner.privacybrowser.views.ULTRAPRIVACY
 import com.stoutner.privacybrowser.views.NestedScrollWebView
 
@@ -195,34 +234,38 @@ private const val SAVED_STATE_ARRAY_LIST = "saved_state_array_list"
 private const val SAVED_TAB_POSITION = "saved_tab_position"
 private const val TEMPORARY_MHT_FILE = "temporary_mht_file"
 
-// TODO.  Reorder methods alphabetically.
-
 class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener, FontSizeDialog.UpdateFontSizeListener,
-    NavigationView.OnNavigationItemSelectedListener, OpenDialog.OpenListener, PinnedMismatchDialog.PinnedMismatchListener, PopulateBlocklistsCoroutine.PopulateBlocklistsListener, SaveDialog.SaveListener,
+    NavigationView.OnNavigationItemSelectedListener, OpenDialog.OpenListener, PinnedMismatchDialog.PinnedMismatchListener, PopulateFilterListsCoroutine.PopulateFilterListsListener, SaveDialog.SaveListener,
     UrlHistoryDialog.NavigateHistoryListener, WebViewTabFragment.NewTabListener {
 
     companion object {
         // Define the public static variables.
-        var currentBookmarksFolder = ""
+        var currentBookmarksFolderId = 0L
         val executorService = Executors.newFixedThreadPool(4)!!
         var orbotStatus = "unknown"
         val pendingDialogsArrayList = ArrayList<PendingDialogDataClass>()
         var proxyMode = ProxyHelper.NONE
         var restartFromBookmarksActivity = false
-        var webViewPagerAdapter: WebViewPagerAdapter? = null
+        var webViewStateAdapter: WebViewStateAdapter? = null
 
         // Declare the public static variables.
         lateinit var appBarLayout: AppBarLayout
+        lateinit var defaultFavoriteIconBitmap : Bitmap
     }
 
     // Declare the class variables.
     private lateinit var appBar: ActionBar
+    private lateinit var checkFilterListHelper: CheckFilterListHelper
     private lateinit var bookmarksCursorAdapter: CursorAdapter
     private lateinit var bookmarksListView: ListView
     private lateinit var bookmarksDrawerPinnedImageView: ImageView
     private lateinit var bookmarksTitleTextView: TextView
     private lateinit var coordinatorLayout: CoordinatorLayout
     private lateinit var cookieManager: CookieManager
+    private lateinit var defaultFontSizeString: String
+    private lateinit var defaultUserAgentName: String
+    private lateinit var defaultWebViewTheme: String
+    private lateinit var domainsSettingsSet: MutableSet<String>
     private lateinit var drawerLayout: DrawerLayout
     private lateinit var easyList: ArrayList<List<Array<String>>>
     private lateinit var easyPrivacy: ArrayList<List<Array<String>>>
@@ -239,13 +282,13 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private lateinit var navigationForwardMenuItem: MenuItem
     private lateinit var navigationHistoryMenuItem: MenuItem
     private lateinit var navigationRequestsMenuItem: MenuItem
+    private lateinit var navigationScrollToBottomMenuItem: MenuItem
+    private lateinit var navigationView: NavigationView
     private lateinit var optionsAddOrEditDomainMenuItem: MenuItem
     private lateinit var optionsBlockAllThirdPartyRequestsMenuItem: MenuItem
-    private lateinit var optionsBlocklistsMenuItem: MenuItem
     private lateinit var optionsClearCookiesMenuItem: MenuItem
     private lateinit var optionsClearDataMenuItem: MenuItem
     private lateinit var optionsClearDomStorageMenuItem: MenuItem
-    private lateinit var optionsClearFormDataMenuItem: MenuItem
     private lateinit var optionsCookiesMenuItem: MenuItem
     private lateinit var optionsDarkWebViewMenuItem: MenuItem
     private lateinit var optionsDisplayImagesMenuItem: MenuItem
@@ -254,6 +297,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private lateinit var optionsEasyPrivacyMenuItem: MenuItem
     private lateinit var optionsFanboysAnnoyanceListMenuItem: MenuItem
     private lateinit var optionsFanboysSocialBlockingListMenuItem: MenuItem
+    private lateinit var optionsFilterListsMenuItem: MenuItem
     private lateinit var optionsFontSizeMenuItem: MenuItem
     private lateinit var optionsPrivacyMenuItem: MenuItem
     private lateinit var optionsProxyCustomMenuItem: MenuItem
@@ -262,7 +306,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private lateinit var optionsProxyNoneMenuItem: MenuItem
     private lateinit var optionsProxyTorMenuItem: MenuItem
     private lateinit var optionsRefreshMenuItem: MenuItem
-    private lateinit var optionsSaveFormDataMenuItem: MenuItem
     private lateinit var optionsSwipeToRefreshMenuItem: MenuItem
     private lateinit var optionsUltraListMenuItem: MenuItem
     private lateinit var optionsUltraPrivacyMenuItem: MenuItem
@@ -274,12 +317,12 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private lateinit var optionsUserAgentFirefoxOnAndroidMenuItem: MenuItem
     private lateinit var optionsUserAgentFirefoxOnLinuxMenuItem: MenuItem
     private lateinit var optionsUserAgentFirefoxOnWindowsMenuItem: MenuItem
-    private lateinit var optionsUserAgentInternetExplorerOnWindowsMenuItem: MenuItem
     private lateinit var optionsUserAgentMenuItem: MenuItem
     private lateinit var optionsUserAgentPrivacyBrowserMenuItem: MenuItem
     private lateinit var optionsUserAgentSafariOnIosMenuItem: MenuItem
     private lateinit var optionsUserAgentSafariOnMacosMenuItem: MenuItem
     private lateinit var optionsUserAgentWebViewDefaultMenuItem: MenuItem
+    private lateinit var optionsViewSourceMenuItem: MenuItem
     private lateinit var optionsWideViewportMenuItem: MenuItem
     private lateinit var proxyHelper: ProxyHelper
     private lateinit var redColorSpan: ForegroundColorSpan
@@ -292,31 +335,48 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private lateinit var tabsLinearLayout: LinearLayout
     private lateinit var toolbar: Toolbar
     private lateinit var webViewDefaultUserAgent: String
-    private lateinit var webViewPager: ViewPager
+    private lateinit var webViewThemeEntryValuesStringArray: Array<String>
+    private lateinit var webViewViewPager2: ViewPager2
     private lateinit var ultraList: ArrayList<List<Array<String>>>
     private lateinit var urlEditText: EditText
     private lateinit var urlRelativeLayout: RelativeLayout
+    private lateinit var userAgentDataArray: Array<String>
+    private lateinit var userAgentNamesArray: Array<String>
+    private lateinit var userAgentDataArrayAdapter: ArrayAdapter<CharSequence>
+    private lateinit var userAgentNamesArrayAdapter: ArrayAdapter<CharSequence>
 
     // Define the class variables.
-    private var actionBarDrawerToggle: ActionBarDrawerToggle? = null
     private var appBarHeight = 0
     private var bookmarksCursor: Cursor? = null
     private var bookmarksDatabaseHelper: BookmarksDatabaseHelper? = null
     private var bookmarksDrawerPinned = false
     private var bottomAppBar = false
     private var currentWebView: NestedScrollWebView? = null
+    private var defaultBlockAllThirdPartyRequests = false
+    private var defaultCookies = false
+    private var defaultDisplayWebpageImages = true
+    private var defaultDomStorage = false
+    private var defaultEasyList = true
+    private var defaultEasyPrivacy = true
+    private var defaultFanboysAnnoyanceList = true
+    private var defaultFanboysSocialBlockingList = true
     private var defaultProgressViewEndOffset = 0
     private var defaultProgressViewStartOffset = 0
+    private var defaultJavaScript = false
+    private var defaultSwipeToRefresh = true
+    private var defaultUltraList = true
+    private var defaultUltraPrivacy = true
+    private var defaultWideViewport = true
     private var displayAdditionalAppBarIcons = false
     private var displayingFullScreenVideo = false
     private var domainsDatabaseHelper: DomainsDatabaseHelper? = null
-    private var domainsSettingsSet: MutableSet<String> = HashSet()
     private var downloadWithExternalApp = false
     private var fullScreenBrowsingModeEnabled = false
-    private var hideAppBar = false
+    private var hideAppBar = true
     private var inFullScreenBrowsingMode = false
     private var incognitoModeEnabled = false
     private var loadingNewIntent = false
+    private var navigationDrawerFirstView = true
     private var objectAnimator = ObjectAnimator()
     private var optionsMenu: Menu? = null
     private var orbotStatusBroadcastReceiver: BroadcastReceiver? = null
@@ -332,6 +392,12 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private var ultraPrivacy: ArrayList<List<Array<String>>>? = null
     private var waitingForProxy = false
 
+    // Define the save webpage image activity result launcher.  It must be defined before `onCreate()` is run or the app will crash.
+    private val browseFileUploadActivityResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { activityResult ->
+        // Pass the file to the WebView.
+        fileChooserCallback.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(activityResult.resultCode, activityResult.data))
+    }
+
     // Define the save URL activity result launcher.  It must be defined before `onCreate()` is run or the app will crash.
     private val saveUrlActivityResultLauncher = registerForActivityResult<String, Uri>(ActivityResultContracts.CreateDocument("*/*")) { fileUri ->
         // Only save the URL if the file URI is not null, which happens if the user exited the file picker by pressing back.
@@ -351,23 +417,17 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private val saveWebpageArchiveActivityResultLauncher = registerForActivityResult<String, Uri>(ActivityResultContracts.CreateDocument("multipart/related")) { fileUri ->
         // Only save the webpage archive if the file URI is not null, which happens if the user exited the file picker by pressing back.
         if (fileUri != null) {
-            // Initialize the file name string from the file URI last path segment.
-            var fileNameString = fileUri.lastPathSegment
-
-            // Query the exact file name if the API >= 26.
-            if (Build.VERSION.SDK_INT >= 26) {
-                // Get a cursor from the content resolver.
-                val contentResolverCursor = contentResolver.query(fileUri, null, null, null)!!
+            // Get a cursor from the content resolver.
+            val contentResolverCursor = contentResolver.query(fileUri, null, null, null)!!
 
-                // Move to the fist row.
-                contentResolverCursor.moveToFirst()
+            // Move to the fist row.
+            contentResolverCursor.moveToFirst()
 
-                // Get the file name from the cursor.
-                fileNameString = contentResolverCursor.getString(contentResolverCursor.getColumnIndexOrThrow(OpenableColumns.DISPLAY_NAME))
+            // Get the file name from the cursor.
+            val fileNameString = contentResolverCursor.getString(contentResolverCursor.getColumnIndexOrThrow(OpenableColumns.DISPLAY_NAME))
 
-                // Close the cursor.
-                contentResolverCursor.close()
-            }
+            // Close the cursor.
+            contentResolverCursor.close()
 
             // Use a coroutine to save the file.
             CoroutineScope(Dispatchers.Main).launch {
@@ -438,12 +498,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         }
     }
 
-    // Define the save webpage image activity result launcher.  It must be defined before `onCreate()` is run or the app will crash.
-    private val browseFileUploadActivityResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { activityResult ->
-        // Pass the file to the WebView.
-        fileChooserCallback.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(activityResult.resultCode, activityResult.data))
-    }
-
     override fun onCreate(savedInstanceState: Bundle?) {
         // Run the default commands.
         super.onCreate(savedInstanceState)
@@ -459,8 +513,17 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         val allowScreenshots = sharedPreferences.getBoolean(getString(R.string.allow_screenshots_key), false)
         bottomAppBar = sharedPreferences.getBoolean(getString(R.string.bottom_app_bar_key), false)
         displayAdditionalAppBarIcons = sharedPreferences.getBoolean(getString(R.string.display_additional_app_bar_icons_key), false)
+        val displayUnderCutouts = sharedPreferences.getBoolean(getString(R.string.display_under_cutouts_key), false)
+
+        // Display under cutouts if specified.  This must be done here as it doesn't appear to work correctly if handled after the app is fully initialized.
+        if (displayUnderCutouts) {
+            if (Build.VERSION.SDK_INT >= 30)
+                window.attributes.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS
+            else if (Build.VERSION.SDK_INT >= 28)
+                window.attributes.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
+        }
 
-        // Get the theme entry values string array.
+        // Get the entry values string arrays.
         val appThemeEntryValuesStringArray = resources.getStringArray(R.array.app_theme_entry_values)
 
         // Get the current theme status.
@@ -485,7 +548,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
         // Do not continue if the app theme is different than the OS theme.  The app always initially starts in the OS theme.
         // If the user has specified the opposite theme should be used, the app will restart in that mode after the above `setDefaultNightMode()` code processes.  However, the restart is delayed.
-        // If the blacklist coroutine starts below it will continue to run during the restart, which leads to indeterminate behavior, with the system often not knowing how many tabs exist.
+        // If the filter list coroutine starts below it will continue to run during the restart, which leads to indeterminate behavior, with the system often not knowing how many tabs exist.
         // See https://redmine.stoutner.com/issues/952.
         if ((appTheme == appThemeEntryValuesStringArray[0]) ||  // The system default theme is used.
             ((appTheme == appThemeEntryValuesStringArray[1]) && (currentThemeStatus == Configuration.UI_MODE_NIGHT_NO)) ||  // The app is running in day theme as desired.
@@ -529,8 +592,8 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             tabsLinearLayout = findViewById(R.id.tabs_linearlayout)
             tabLayout = findViewById(R.id.tablayout)
             swipeRefreshLayout = findViewById(R.id.swiperefreshlayout)
-            webViewPager = findViewById(R.id.webviewpager)
-            val navigationView = findViewById<NavigationView>(R.id.navigationview)
+            webViewViewPager2 = findViewById(R.id.webview_viewpager2)
+            navigationView = findViewById(R.id.navigationview)
             bookmarksListView = findViewById(R.id.bookmarks_drawer_listview)
             bookmarksTitleTextView = findViewById(R.id.bookmarks_title_textview)
             bookmarksDrawerPinnedImageView = findViewById(R.id.bookmarks_drawer_pinned_imageview)
@@ -542,6 +605,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             // Get handles for the navigation menu items.
             navigationBackMenuItem = navigationMenu.findItem(R.id.back)
             navigationForwardMenuItem = navigationMenu.findItem(R.id.forward)
+            navigationScrollToBottomMenuItem = navigationMenu.findItem(R.id.scroll_to_bottom)
             navigationHistoryMenuItem = navigationMenu.findItem(R.id.history)
             navigationRequestsMenuItem = navigationMenu.findItem(R.id.requests)
 
@@ -564,23 +628,23 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             urlRelativeLayout = findViewById(R.id.url_relativelayout)
             urlEditText = findViewById(R.id.url_edittext)
 
-            // Create the hamburger icon at the start of the AppBar.
-            actionBarDrawerToggle = ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.open_navigation_drawer, R.string.close_navigation_drawer)
-
-            // Initially disable the sliding drawers.  They will be enabled once the blocklists are loaded.
+            // Initially disable the sliding drawers.  They will be enabled once the filter lists are loaded.
             drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
 
-            // Initially hide the user interface so that only the blocklist loading screen is shown (if reloading).
+            // Initially hide the user interface so that only the filter list loading screen is shown (if reloading).
             drawerLayout.visibility = View.GONE
 
-            // Initialize the WebView pager adapter.
-            webViewPagerAdapter = WebViewPagerAdapter(supportFragmentManager)
+            // Initialize the WebView state adapter.
+            webViewStateAdapter = WebViewStateAdapter(this, bottomAppBar)
 
-            // Set the pager adapter on the web view pager.
-            webViewPager.adapter = webViewPagerAdapter
+            // Set the WebView pager adapter.
+            webViewViewPager2.adapter = webViewStateAdapter
 
             // Store up to 100 tabs in memory.
-            webViewPager.offscreenPageLimit = 100
+            webViewViewPager2.offscreenPageLimit = 100
+
+            // Disable swiping between pages in the view pager.
+            webViewViewPager2.isUserInputEnabled = false
 
             // Get a handle for the cookie manager.
             cookieManager = CookieManager.getInstance()
@@ -593,6 +657,15 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             // Update the bookmarks drawer pinned image view.
             updateBookmarksDrawerPinnedImageView()
 
+            // Get the default favorite icon drawable.
+            val favoriteIconDrawable = AppCompatResources.getDrawable(this, R.drawable.world)
+
+            // Cast the favorite icon drawable to a bitmap drawable.
+            val favoriteIconBitmapDrawable = (favoriteIconDrawable as BitmapDrawable?)!!
+
+            // Store the default favorite icon bitmap.
+            defaultFavoriteIconBitmap = favoriteIconBitmapDrawable.bitmap
+
             // Initialize the app.
             initializeApp()
 
@@ -614,23 +687,11 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                         exitFullScreenVideo()
                         // It shouldn't be possible for the currentWebView to be null, but crash logs indicate it sometimes happens.
                     } else if (currentWebView != null && currentWebView!!.canGoBack()) {  // There is at least one item in the current WebView history.
-                        // Get the current web back forward list.
-                        val webBackForwardList = currentWebView!!.copyBackForwardList()
-
-                        // Get the previous entry URL.
-                        val previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.currentIndex - 1).url
-
-                        // Apply the domain settings.
-                        applyDomainSettings(currentWebView!!, previousUrl, resetTab = false, reloadWebsite = false, loadUrl = false)
-
-                        // Go back.
-                        currentWebView!!.goBack()
-                    } else if (tabLayout.tabCount > 1) {  // There are at least two tabs.
-                        // Close the current tab.
-                        closeCurrentTab()
-                    } else {  // There isn't anything to do in Privacy Browser.
-                        // Run clear and exit.
-                        clearAndExit()
+                        // Navigate back one page.
+                        navigateHistory(-1)
+                    } else {  // Close the current tab.
+                        // A view is required because the method is also called by an XML `onClick`.
+                        closeTab(null)
                     }
                 }
             }
@@ -638,11 +699,11 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             // Register the on back pressed callback.
             onBackPressedDispatcher.addCallback(this, onBackPressedCallback)
 
-            // Instantiate the populate blocklists coroutine.
-            val populateBlocklistsCoroutine = PopulateBlocklistsCoroutine(this)
+            // Instantiate the populate filter lists coroutine.
+            val populateFilterListsCoroutine = PopulateFilterListsCoroutine(this)
 
-            // Populate the blocklists.
-            populateBlocklistsCoroutine.populateBlocklists(this)
+            // Populate the filter lists.
+            populateFilterListsCoroutine.populateFilterLists(this)
         }
     }
 
@@ -650,6 +711,14 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         // Run the default commands.
         super.onNewIntent(intent)
 
+        // Close the navigation drawer if it is open.
+        if (drawerLayout.isDrawerVisible(GravityCompat.START))
+            drawerLayout.closeDrawer(GravityCompat.START)
+
+        // Close the bookmarks drawer if it is open.
+        if (drawerLayout.isDrawerVisible(GravityCompat.END))
+            drawerLayout.closeDrawer(GravityCompat.END)
+
         // Get the information from the intent.
         val intentAction = intent.action
         val intentUriData = intent.data
@@ -692,26 +761,13 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     loadingNewIntent = true
 
                     // Add a new tab.
-                    addNewTab(url!!, true)
+                    addNewPage(url!!, adjacent = false, moveToTab = true)
                 } else {  // Load the URL in the current tab.
                     // Make it so.
                     loadUrl(currentWebView!!, url!!)
                 }
-
-                // Close the navigation drawer if it is open.
-                if (drawerLayout.isDrawerVisible(GravityCompat.START))
-                    drawerLayout.closeDrawer(GravityCompat.START)
-
-                // Close the bookmarks drawer if it is open.
-                if (drawerLayout.isDrawerVisible(GravityCompat.END))
-                    drawerLayout.closeDrawer(GravityCompat.END)
             }
         } else {  // The app has been restarted.
-            // If the new intent will open a new tab, set the saved tab position to be the size of the saved state array list.
-            // The tab position is 0 based, meaning the at the new tab will be the tab position that is restored.
-            if ((intentUriData != null) || (intentStringExtra != null) || isWebSearch)
-                savedTabPosition = savedStateArrayList!!.size
-
             // Replace the intent that started the app with this one.  This will load the tab after the others have been restored.
             setIntent(intent)
         }
@@ -739,9 +795,9 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             updateDomainsSettingsSet()
 
             // Reapply the domain settings for each tab.
-            for (i in 0 until webViewPagerAdapter!!.count) {
+            for (i in 0 until webViewStateAdapter!!.itemCount) {
                 // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+                val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
                 // Get the fragment view.
                 val fragmentView = webViewTabFragment.view
@@ -782,11 +838,11 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         // Run the default commands.
         super.onStart()
 
-        // Resume any WebViews if the pager adapter exists.  If the app is restarting to change the initial app theme it won't have been populated yet.
-        if (webViewPagerAdapter != null) {
-            for (i in 0 until webViewPagerAdapter!!.count) {
+        // Resume any WebViews if the state adapter exists.  If the app is restarting to change the initial app theme it won't have been populated yet.
+        if (webViewStateAdapter != null) {
+            for (i in 0 until webViewStateAdapter!!.itemCount) {
                 // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+                val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
                 // Get the fragment view.
                 val fragmentView = webViewTabFragment.view
@@ -837,51 +893,20 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         pendingDialogsArrayList.clear()
     }
 
-    // `onStop()` runs after `onPause()`.  It is used instead of `onPause()` so the commands are not called every time the screen is partially hidden.
-    public override fun onStop() {
-        // Run the default commands.
-        super.onStop()
-
-        // Only pause the WebViews if the pager adapter is not null, which is the case if the app is restarting to change the initial app theme.
-        if (webViewPagerAdapter != null) {
-            // Pause each web view.
-            for (i in 0 until webViewPagerAdapter!!.count) {
-                // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
-
-                // Get the fragment view.
-                val fragmentView = webViewTabFragment.view
-
-                // Only pause the WebViews if they exist (they won't when the app is first created).
-                if (fragmentView != null) {
-                    // Get the nested scroll WebView from the tab fragment.
-                    val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
-
-                    // Pause the nested scroll WebView.
-                    nestedScrollWebView.onPause()
-                }
-            }
-        }
-
-        // Pause the WebView JavaScript timers.  This is a global command that pauses JavaScript on all WebViews.
-        if (currentWebView != null)
-            currentWebView!!.pauseTimers()
-    }
-
     public override fun onSaveInstanceState(savedInstanceState: Bundle) {
         // Run the default commands.
         super.onSaveInstanceState(savedInstanceState)
 
-        // Only save the instance state if the WebView pager adapter is not null, which will be the case if the app is restarting to change the initial app theme.
-        if (webViewPagerAdapter != null) {
+        // Only save the instance state if the WebView state adapter is not null, which will be the case if the app is restarting to change the initial app theme.
+        if (webViewStateAdapter != null) {
             // Initialize the saved state array lists.
             savedStateArrayList = ArrayList<Bundle>()
             savedNestedScrollWebViewStateArrayList = ArrayList<Bundle>()
 
             // Get the URLs from each tab.
-            for (i in 0 until webViewPagerAdapter!!.count) {
+            for (i in 0 until webViewStateAdapter!!.itemCount) {
                 // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+                val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
                 // Get the fragment view.
                 val fragmentView = webViewTabFragment.view
@@ -916,6 +941,37 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         }
     }
 
+    // `onStop()` runs after `onPause()`.  It is used instead of `onPause()` so the commands are not called every time the screen is partially hidden.
+    public override fun onStop() {
+        // Run the default commands.
+        super.onStop()
+
+        // Only pause the WebViews if the state adapter is not null, which is the case if the app is restarting to change the initial app theme.
+        if (webViewStateAdapter != null) {
+            // Pause each web view.
+            for (i in 0 until webViewStateAdapter!!.itemCount) {
+                // Get the WebView tab fragment.
+                val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
+
+                // Get the fragment view.
+                val fragmentView = webViewTabFragment.view
+
+                // Only pause the WebViews if they exist (they won't when the app is first created).
+                if (fragmentView != null) {
+                    // Get the nested scroll WebView from the tab fragment.
+                    val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
+
+                    // Pause the nested scroll WebView.
+                    nestedScrollWebView.onPause()
+                }
+            }
+        }
+
+        // Pause the WebView JavaScript timers.  This is a global command that pauses JavaScript on all WebViews.
+        if (currentWebView != null)
+            currentWebView!!.pauseTimers()
+    }
+
     public override fun onDestroy() {
         // Unregister the orbot status broadcast receiver if it exists.
         if (orbotStatusBroadcastReceiver != null) {
@@ -933,6 +989,29 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         super.onDestroy()
     }
 
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        // Run the default commands.
+        super.onConfigurationChanged(newConfig)
+
+        // Reset the navigation drawer first view flag.
+        navigationDrawerFirstView = true
+
+        // Get the current page.
+        val currentPage = webViewViewPager2.currentItem
+
+        // Toggle the pages if there is more than one so that the view pager will recalculate their size.
+        if (currentPage > 0) {
+            // Switch to the previous page after 25 milliseconds.
+            webViewViewPager2.postDelayed ({ webViewViewPager2.currentItem = (currentPage - 1) }, 25)
+
+            // Switch back to the current page after the view pager has quiesced (which we are deciding should be 25 milliseconds).
+            webViewViewPager2.postDelayed ({ webViewViewPager2.currentItem = currentPage }, 25)
+        }
+
+        // Scroll to the current tab position after 25 milliseconds.
+        tabLayout.postDelayed ({ tabLayout.setScrollPosition(currentPage, 0F, false, false) }, 25)
+    }
+
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         // Inflate the menu.  This adds items to the app bar if it is present.
         menuInflater.inflate(R.menu.webview_options_menu, menu)
@@ -943,16 +1022,14 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         val optionsBookmarksMenuItem = menu.findItem(R.id.bookmarks)
         optionsCookiesMenuItem = menu.findItem(R.id.cookies)
         optionsDomStorageMenuItem = menu.findItem(R.id.dom_storage)
-        optionsSaveFormDataMenuItem = menu.findItem(R.id.save_form_data) // Form data can be removed once the minimum API >= 26.
         optionsClearDataMenuItem = menu.findItem(R.id.clear_data)
         optionsClearCookiesMenuItem = menu.findItem(R.id.clear_cookies)
         optionsClearDomStorageMenuItem = menu.findItem(R.id.clear_dom_storage)
-        optionsClearFormDataMenuItem = menu.findItem(R.id.clear_form_data) // Form data can be removed once the minimum API >= 26.
-        optionsBlocklistsMenuItem = menu.findItem(R.id.blocklists)
         optionsEasyListMenuItem = menu.findItem(R.id.easylist)
         optionsEasyPrivacyMenuItem = menu.findItem(R.id.easyprivacy)
         optionsFanboysAnnoyanceListMenuItem = menu.findItem(R.id.fanboys_annoyance_list)
         optionsFanboysSocialBlockingListMenuItem = menu.findItem(R.id.fanboys_social_blocking_list)
+        optionsFilterListsMenuItem = menu.findItem(R.id.filterlists)
         optionsUltraListMenuItem = menu.findItem(R.id.ultralist)
         optionsUltraPrivacyMenuItem = menu.findItem(R.id.ultraprivacy)
         optionsBlockAllThirdPartyRequestsMenuItem = menu.findItem(R.id.block_all_third_party_requests)
@@ -972,7 +1049,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         optionsUserAgentFirefoxOnWindowsMenuItem = menu.findItem(R.id.user_agent_firefox_on_windows)
         optionsUserAgentChromeOnWindowsMenuItem = menu.findItem(R.id.user_agent_chrome_on_windows)
         optionsUserAgentEdgeOnWindowsMenuItem = menu.findItem(R.id.user_agent_edge_on_windows)
-        optionsUserAgentInternetExplorerOnWindowsMenuItem = menu.findItem(R.id.user_agent_internet_explorer_on_windows)
         optionsUserAgentSafariOnMacosMenuItem = menu.findItem(R.id.user_agent_safari_on_macos)
         optionsUserAgentCustomMenuItem = menu.findItem(R.id.user_agent_custom)
         optionsSwipeToRefreshMenuItem = menu.findItem(R.id.swipe_to_refresh)
@@ -980,21 +1056,12 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         optionsDisplayImagesMenuItem = menu.findItem(R.id.display_images)
         optionsDarkWebViewMenuItem = menu.findItem(R.id.dark_webview)
         optionsFontSizeMenuItem = menu.findItem(R.id.font_size)
+        optionsViewSourceMenuItem = menu.findItem(R.id.view_source)
         optionsAddOrEditDomainMenuItem = menu.findItem(R.id.add_or_edit_domain)
 
         // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
         updatePrivacyIcons(false)
 
-        // Only display the form data menu items if the API < 26.
-        optionsSaveFormDataMenuItem.isVisible = Build.VERSION.SDK_INT < 26
-        optionsClearFormDataMenuItem.isVisible = Build.VERSION.SDK_INT < 26
-
-        // Disable the clear form data menu item if the API >= 26 so that the status of the main Clear Data is calculated correctly.
-        optionsClearFormDataMenuItem.isEnabled = Build.VERSION.SDK_INT < 26
-
-        // Only display the dark WebView menu item if the API >= 29.
-        optionsDarkWebViewMenuItem.isVisible = Build.VERSION.SDK_INT >= 29
-
         // Set the status of the additional app bar icons.  Setting the refresh menu item to `SHOW_AS_ACTION_ALWAYS` makes it appear even on small devices like phones.
         if (displayAdditionalAppBarIcons) {  // Display the additional icons.
             optionsRefreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS)
@@ -1011,7 +1078,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             // Set the title.
             optionsRefreshMenuItem.setTitle(R.string.stop)
 
-            // Set the icon if it is displayed in the app bar.  Once the minimum API is >= 26, the blue and black icons can be combined with a tint list.
+            // Set the icon if it is displayed in the app bar.
             if (displayAdditionalAppBarIcons)
                 optionsRefreshMenuItem.setIcon(R.drawable.close_blue)
         }
@@ -1044,8 +1111,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
             // Set the status of the menu item checkboxes.
             optionsDomStorageMenuItem.isChecked = currentWebView!!.settings.domStorageEnabled
-            @Suppress("DEPRECATION")
-            optionsSaveFormDataMenuItem.isChecked = currentWebView!!.settings.saveFormData // Form data can be removed once the minimum API >= 26.
             optionsEasyListMenuItem.isChecked = currentWebView!!.easyListEnabled
             optionsEasyPrivacyMenuItem.isChecked = currentWebView!!.easyPrivacyEnabled
             optionsFanboysAnnoyanceListMenuItem.isChecked = currentWebView!!.fanboysAnnoyanceListEnabled
@@ -1057,13 +1122,13 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             optionsWideViewportMenuItem.isChecked = currentWebView!!.settings.useWideViewPort
             optionsDisplayImagesMenuItem.isChecked = currentWebView!!.settings.loadsImagesAutomatically
 
-            // Initialize the display names for the blocklists with the number of blocked requests.
-            optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + currentWebView!!.getRequestsCount(BLOCKED_REQUESTS)
+            // Set the display names for the filter lists with the number of blocked requests.
+            optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + currentWebView!!.getRequestsCount(BLOCKED_REQUESTS)
             optionsEasyListMenuItem.title = currentWebView!!.getRequestsCount(EASYLIST).toString() + " - " + getString(R.string.easylist)
             optionsEasyPrivacyMenuItem.title = currentWebView!!.getRequestsCount(EASYPRIVACY).toString() + " - " + getString(R.string.easyprivacy)
             optionsFanboysAnnoyanceListMenuItem.title = currentWebView!!.getRequestsCount(FANBOYS_ANNOYANCE_LIST).toString() + " - " + getString(R.string.fanboys_annoyance_list)
             optionsFanboysSocialBlockingListMenuItem.title = currentWebView!!.getRequestsCount(FANBOYS_SOCIAL_BLOCKING_LIST).toString() + " - " + getString(R.string.fanboys_social_blocking_list)
-            optionsUltraListMenuItem.title = currentWebView!!.getRequestsCount(ULTRALIST).toString() + " - " + getString(R.string.ultralist)
+            optionsUltraListMenuItem.title = currentWebView!!.getRequestsCount(com.stoutner.privacybrowser.views.ULTRALIST).toString() + " - " + getString(R.string.ultralist)
             optionsUltraPrivacyMenuItem.title = currentWebView!!.getRequestsCount(ULTRAPRIVACY).toString() + " - " + getString(R.string.ultraprivacy)
             optionsBlockAllThirdPartyRequestsMenuItem.title = currentWebView!!.getRequestsCount(THIRD_PARTY_REQUESTS).toString() + " - " + getString(R.string.block_all_third_party_requests)
 
@@ -1076,9 +1141,15 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             // Enable dark WebView if night mode is enabled.
             optionsDarkWebViewMenuItem.isEnabled = (currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
 
-            // Set the checkbox status for dark WebView if the device is running API >= 29 and algorithmic darkening is supported.
-            if ((Build.VERSION.SDK_INT >= 29) && WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING))
+            // Set the checkbox status for dark WebView if algorithmic darkening is supported.
+            if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING))
                 optionsDarkWebViewMenuItem.isChecked = WebSettingsCompat.isAlgorithmicDarkeningAllowed(currentWebView!!.settings)
+
+            // Set the view source title according to the current URL.
+            if (currentWebView!!.currentUrl.startsWith("view-source:"))
+                optionsViewSourceMenuItem.title = getString(R.string.view_rendered_website)
+            else
+                optionsViewSourceMenuItem.title = getString(R.string.view_source)
         }
 
         // Set the cookies menu item checked status.
@@ -1109,18 +1180,8 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         // Enable Clear DOM Storage if there is any.
         optionsClearDomStorageMenuItem.isEnabled = localStorageDirectoryNumberOfFiles > 0 || indexedDBDirectoryNumberOfFiles > 0
 
-        // Enable Clear Form Data is there is any.  This can be removed once the minimum API >= 26.
-        if (Build.VERSION.SDK_INT < 26) {
-            // Get the WebView database.
-            val webViewDatabase = WebViewDatabase.getInstance(this)
-
-            // Enable the clear form data menu item if there is anything to clear.
-            @Suppress("DEPRECATION")
-            optionsClearFormDataMenuItem.isEnabled = webViewDatabase.hasFormData()
-        }
-
         // Enable Clear Data if any of the submenu items are enabled.
-        optionsClearDataMenuItem.isEnabled = (optionsClearCookiesMenuItem.isEnabled || optionsClearDomStorageMenuItem.isEnabled || optionsClearFormDataMenuItem.isEnabled)
+        optionsClearDataMenuItem.isEnabled = (optionsClearCookiesMenuItem.isEnabled || optionsClearDomStorageMenuItem.isEnabled)
 
         // Disable Fanboy's Social Blocking List menu item if Fanboy's Annoyance List is checked.
         optionsFanboysSocialBlockingListMenuItem.isEnabled = !optionsFanboysAnnoyanceListMenuItem.isChecked
@@ -1242,15 +1303,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 optionsUserAgentEdgeOnWindowsMenuItem.isChecked = true
             }
 
-            resources.getStringArray(R.array.user_agent_data)[10] -> {  // Internet Explorer on Windows.
-                // Update the user agent menu item title.
-                optionsUserAgentMenuItem.title = getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_internet_explorer_on_windows)
-
-                // Select the Internet on Windows radio box.
-                optionsUserAgentInternetExplorerOnWindowsMenuItem.isChecked = true
-            }
-
-            resources.getStringArray(R.array.user_agent_data)[11] -> {  // Safari on macOS.
+            resources.getStringArray(R.array.user_agent_data)[10] -> {  // Safari on macOS.
                 // Update the user agent menu item title.
                 optionsUserAgentMenuItem.title = getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_safari_on_macos)
 
@@ -1289,11 +1342,11 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
                 // Display a snackbar.
                 if (currentWebView!!.settings.javaScriptEnabled)  // JavaScrip is enabled.
-                    Snackbar.make(webViewPager, R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show()
                 else if (cookieManager.acceptCookie())  // JavaScript is disabled, but cookies are enabled.
-                    Snackbar.make(webViewPager, R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show()
                 else  // Privacy mode.
-                    Snackbar.make(webViewPager, R.string.privacy_mode, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.privacy_mode, Snackbar.LENGTH_SHORT).show()
 
                 // Reload the current WebView.
                 currentWebView!!.reload()
@@ -1336,11 +1389,11 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
                 // Display a snackbar.
                 if (cookieManager.acceptCookie())  // Cookies are enabled.
-                    Snackbar.make(webViewPager, R.string.cookies_enabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.cookies_enabled, Snackbar.LENGTH_SHORT).show()
                 else if (currentWebView!!.settings.javaScriptEnabled)  // JavaScript is still enabled.
-                    Snackbar.make(webViewPager, R.string.cookies_disabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.cookies_disabled, Snackbar.LENGTH_SHORT).show()
                 else  // Privacy mode.
-                    Snackbar.make(webViewPager, R.string.privacy_mode, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.privacy_mode, Snackbar.LENGTH_SHORT).show()
 
                 // Reload the current WebView.
                 currentWebView!!.reload()
@@ -1361,35 +1414,9 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
                 // Display a snackbar.
                 if (currentWebView!!.settings.domStorageEnabled)
-                    Snackbar.make(webViewPager, R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show()
-                else
-                    Snackbar.make(webViewPager, R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show()
-
-                // Reload the current WebView.
-                currentWebView!!.reload()
-
-                // Consume the event.
-                true
-            }
-
-            R.id.save_form_data -> {  // Form data.  This can be removed once the minimum API >= 26.
-                // Switch the status of saveFormDataEnabled.
-                @Suppress("DEPRECATION")
-                currentWebView!!.settings.saveFormData = !currentWebView!!.settings.saveFormData
-
-                // Update the menu checkbox.
-                @Suppress("DEPRECATION")
-                menuItem.isChecked = currentWebView!!.settings.saveFormData
-
-                // Display a snackbar.
-                @Suppress("DEPRECATION")
-                if (currentWebView!!.settings.saveFormData)
-                    Snackbar.make(webViewPager, R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show()
                 else
-                    Snackbar.make(webViewPager, R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show()
-
-                // Update the privacy icon.
-                updatePrivacyIcons(true)
+                    Snackbar.make(webViewViewPager2, R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show()
 
                 // Reload the current WebView.
                 currentWebView!!.reload()
@@ -1400,7 +1427,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
             R.id.clear_cookies -> {  // Clear cookies.
                 // Create a snackbar.
-                Snackbar.make(webViewPager, R.string.cookies_deleted, Snackbar.LENGTH_LONG)
+                Snackbar.make(webViewViewPager2, R.string.cookies_deleted, Snackbar.LENGTH_LONG)
                     .setAction(R.string.undo) {}  // Everything will be handled by `onDismissed()` below.
                     .addCallback(object : Snackbar.Callback() {
                         override fun onDismissed(snackbar: Snackbar, event: Int) {
@@ -1418,7 +1445,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
             R.id.clear_dom_storage -> {  // Clear DOM storage.
                 // Create a snackbar.
-                Snackbar.make(webViewPager, R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
+                Snackbar.make(webViewViewPager2, R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
                     .setAction(R.string.undo) {}  // Everything will be handled by `onDismissed()` below.
                     .addCallback(object : Snackbar.Callback() {
                         override fun onDismissed(snackbar: Snackbar, event: Int) {
@@ -1473,28 +1500,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 true
             }
 
-            R.id.clear_form_data -> {  // Clear form data.  This can be remove once the minimum API >= 26.
-                // Create a snackbar.
-                Snackbar.make(webViewPager, R.string.form_data_deleted, Snackbar.LENGTH_LONG)
-                    .setAction(R.string.undo) {}  // Everything will be handled by `onDismissed()` below.
-                    .addCallback(object : Snackbar.Callback() {
-                        override fun onDismissed(snackbar: Snackbar, event: Int) {
-                            if (event != DISMISS_EVENT_ACTION) {  // The snackbar was dismissed without the undo button being pushed.
-                                // Get a handle for the webView database.
-                                val webViewDatabase = WebViewDatabase.getInstance(applicationContext)
-
-                                // Delete the form data.
-                                @Suppress("DEPRECATION")
-                                webViewDatabase.clearFormData()
-                            }
-                        }
-                    })
-                    .show()
-
-                // Consume the event.
-                true
-            }
-
             R.id.easylist -> {  // EasyList.
                 // Toggle the EasyList status.
                 currentWebView!!.easyListEnabled = !currentWebView!!.easyListEnabled
@@ -1750,20 +1755,9 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 true
             }
 
-            R.id.user_agent_internet_explorer_on_windows -> {  // User Agent - Internet Explorer on Windows.
-                // Update the user agent.
-                currentWebView!!.settings.userAgentString = resources.getStringArray(R.array.user_agent_data)[10]
-
-                // Reload the current WebView.
-                currentWebView!!.reload()
-
-                // Consume the event.
-                true
-            }
-
             R.id.user_agent_safari_on_macos -> {  // User Agent - Safari on macOS.
                 // Update the user agent.
-                currentWebView!!.settings.userAgentString = resources.getStringArray(R.array.user_agent_data)[11]
+                currentWebView!!.settings.userAgentString = resources.getStringArray(R.array.user_agent_data)[10]
 
                 // Reload the current WebView.
                 currentWebView!!.reload()
@@ -1835,7 +1829,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
             R.id.dark_webview -> {  // Dark WebView.
                 // Toggle dark WebView if supported.
-                if ((Build.VERSION.SDK_INT >= 29) && WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING))
+                if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING))
                     WebSettingsCompat.setAlgorithmicDarkeningAllowed(currentWebView!!.settings, !WebSettingsCompat.isAlgorithmicDarkeningAllowed(currentWebView!!.settings)
                 )
 
@@ -1887,7 +1881,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             R.id.save_url -> {  // Save URL.
                 // Check the download preference.
                 if (downloadWithExternalApp)  // Download with an external app.
-                    downloadUrlWithExternalApp(currentWebView!!.currentUrl)
+                    saveWithExternalApp(currentWebView!!.currentUrl)
                 else  // Handle the download inside of Privacy Browser.  The dialog will be displayed once the file size and the content disposition have been acquired.
                     PrepareSaveDialogCoroutine.prepareSaveDialog(this, supportFragmentManager, currentWebView!!.currentUrl, currentWebView!!.settings.userAgentString, currentWebView!!.acceptCookies)
 
@@ -1896,8 +1890,8 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             }
 
             R.id.save_archive -> {
-                // Open the file picker with a default file name built from the current domain name.
-                saveWebpageArchiveActivityResultLauncher.launch(currentWebView!!.currentDomainName + ".mht")
+                // Open the file picker with a default file name built from the website title.
+                saveWebpageArchiveActivityResultLauncher.launch(currentWebView!!.title + ".mht")
 
                 // Consume the event.
                 true
@@ -1923,15 +1917,29 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             }
 
             R.id.view_source -> {  // View source.
-                // Create an intent to launch the view source activity.
-                val viewSourceIntent = Intent(this, ViewSourceActivity::class.java)
+                // Open a new tab according to the current URL.
+                if (currentWebView!!.currentUrl.startsWith("view-source:")) {  // The source is currently viewed.
+                    // Open the rendered website in a new tab.
+                    addNewPage(currentWebView!!.currentUrl.substring(12, currentWebView!!.currentUrl.length), true, moveToTab = true)
+                } else {  // The rendered website is currently viewed.
+                    // Open the source in a new tab.
+                    addNewPage("view-source:${currentWebView!!.currentUrl}", adjacent = true, moveToTab = true)
+                }
+
+                // Consume the event.
+                true
+            }
+
+            R.id.view_headers -> {  // View headers.
+                // Create an intent to launch the view headers activity.
+                val viewHeadersIntent = Intent(this, ViewHeadersActivity::class.java)
 
                 // Add the variables to the intent.
-                viewSourceIntent.putExtra(CURRENT_URL, currentWebView!!.url)
-                viewSourceIntent.putExtra(USER_AGENT, currentWebView!!.settings.userAgentString)
+                viewHeadersIntent.putExtra(CURRENT_URL, currentWebView!!.url)
+                viewHeadersIntent.putExtra(USER_AGENT, currentWebView!!.settings.userAgentString)
 
                 // Make it so.
-                startActivity(viewSourceIntent)
+                startActivity(viewHeadersIntent)
 
                 // Consume the event.
                 true
@@ -2000,7 +2008,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             }
 
             R.id.add_or_edit_domain -> {  // Add or edit domain.
-                // Reapply the domain settings on returning to `MainWebViewActivity`.
+                // Reapply the domain settings on returning to the main WebView activity.
                 reapplyDomainSettingsOnRestart = true
 
                 // Check if domain settings are currently applied.
@@ -2011,7 +2019,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     // Add the extra information to the intent.
                     domainsIntent.putExtra(LOAD_DOMAIN, currentWebView!!.domainSettingsDatabaseId)
                     domainsIntent.putExtra(CLOSE_ON_BACK, true)
-                    domainsIntent.putExtra(CURRENT_URL, currentWebView!!.url)
                     domainsIntent.putExtra(CURRENT_IP_ADDRESSES, currentWebView!!.currentIpAddresses)
 
                     // Get the current certificate.
@@ -2049,8 +2056,105 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     // Get the current domain from the URI.  Use an empty string if it is null.
                     val currentDomain = currentUri.host?: ""
 
+                    // Get the current settings status.
+                    val javaScriptInt = calculateSettingsInt(currentWebView!!.settings.javaScriptEnabled, sharedPreferences.getBoolean(getString(R.string.javascript_key), false))
+                    val cookiesInt = calculateSettingsInt(currentWebView!!.acceptCookies, sharedPreferences.getBoolean(getString(R.string.cookies_key), false))
+                    val domStorageInt = calculateSettingsInt(currentWebView!!.settings.domStorageEnabled, sharedPreferences.getBoolean(getString(R.string.dom_storage_key), false))
+                    val easyListInt = calculateSettingsInt(currentWebView!!.easyListEnabled, sharedPreferences.getBoolean(getString(R.string.easylist_key), true))
+                    val easyPrivacyInt = calculateSettingsInt(currentWebView!!.easyPrivacyEnabled, sharedPreferences.getBoolean(getString(R.string.easyprivacy_key), true))
+                    val fanboysAnnoyanceListInt = calculateSettingsInt(currentWebView!!.fanboysAnnoyanceListEnabled, sharedPreferences.getBoolean(getString(R.string.fanboys_annoyance_list_key), true))
+                    val fanboysSocialBlockingListInt = calculateSettingsInt(currentWebView!!.fanboysSocialBlockingListEnabled, sharedPreferences.getBoolean(getString(R.string.fanboys_social_blocking_list_key), true))
+                    val ultraListInt = calculateSettingsInt(currentWebView!!.ultraListEnabled, sharedPreferences.getBoolean(getString(R.string.ultralist_key), true))
+                    val ultraPrivacyInt = calculateSettingsInt(currentWebView!!.ultraPrivacyEnabled, sharedPreferences.getBoolean(getString(R.string.ultraprivacy_key), true))
+                    val blockAllThirdPartyRequestsInt = calculateSettingsInt(currentWebView!!.blockAllThirdPartyRequests, sharedPreferences.getBoolean(getString(R.string.block_all_third_party_requests_key), true))
+                    val swipeToRefreshInt = calculateSettingsInt(currentWebView!!.swipeToRefresh, sharedPreferences.getBoolean(getString(R.string.swipe_to_refresh_key), true))
+                    val wideViewportInt = calculateSettingsInt(currentWebView!!.settings.useWideViewPort, sharedPreferences.getBoolean(getString(R.string.wide_viewport_key), true))
+                    val displayImagesInt = calculateSettingsInt(currentWebView!!.settings.loadsImagesAutomatically, sharedPreferences.getBoolean(getString(R.string.display_webpage_images_key), true))
+
+                    // Get the current user agent string.
+                    val currentUserAgentString = currentWebView!!.settings.userAgentString
+
+                    // Get the user agent string array position.
+                    val userAgentStringArrayPosition = userAgentDataArrayAdapter.getPosition(currentUserAgentString)
+
+                    // Set the user agent name.
+                    val userAgentName = if ((userAgentStringArrayPosition >= 0) && (defaultUserAgentName == userAgentNamesArray[userAgentStringArrayPosition])) {  // The system default user agent is in use.
+                        getString(R.string.system_default_user_agent)
+                    } else {  // An on-the-fly user agent is being used (or the WebView default user agent is applied).
+                        when (userAgentStringArrayPosition) {
+                            UNRECOGNIZED_USER_AGENT -> { // The user agent is unrecognized.
+                                if (currentUserAgentString == webViewDefaultUserAgent) {  // The WebView default user agent is being used.
+                                    if (defaultUserAgentName == getString(R.string.webview_default)) {  // The WebView default user agent is the system default.
+                                        // Set the user agent name to be the system default.
+                                        getString(R.string.system_default_user_agent)
+                                    } else {  // The WebView default user agent is set as an on-the-fly setting.
+                                        // Set the default user agent name.
+                                        getString(R.string.webview_default)
+                                    }
+                                } else {  // A custom user agent is being used.
+                                    if (defaultUserAgentName == getString(R.string.custom_user_agent_non_translatable)) {  // The system custom user agent is in use.
+                                        // Set the user agent name to be the system default.
+                                        getString(R.string.system_default_user_agent)
+                                    } else {  // An on-the-fly custom user agent is in use.
+                                        // Store the user agent as currently applied.
+                                        currentUserAgentString
+                                    }
+                                }
+                            }
+
+                            else ->  // Store the standard user agent name.
+                                userAgentNamesArray[userAgentStringArrayPosition]
+                        }
+                    }
+
+                    // Get the current text zoom integer.
+                    val textZoomInt = currentWebView!!.settings.textZoom
+
+                    // Set the font size integer.
+                    val fontSizeInt = if (textZoomInt == defaultFontSizeString.toInt())  // The current system default is used, which is encoded as a zoom of `0`.
+                        SYSTEM_DEFAULT
+                    else  // A custom font size is used.
+                        textZoomInt
+
+                    // Get the current WebView dark theme status.
+                    val webViewDarkThemeCurrentlyEnabled = if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING))  // Algorithmic darkening is supported.
+                        WebSettingsCompat.isAlgorithmicDarkeningAllowed(currentWebView!!.settings)
+                    else  // Algorithmic darkening is not supported.
+                        false
+
+                    // Get the default WebView dark theme setting.
+                    val defaultWebViewDarkThemeEnabled = if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {  // Algorithmic darkening is supported.
+                        when (defaultWebViewTheme) {
+                            webViewThemeEntryValuesStringArray[1] ->  // The dark theme is disabled by default.
+                                false
+
+                            webViewThemeEntryValuesStringArray[2] ->  // The dark theme is enabled by default.
+                                true
+
+                            else -> {  // The system default theme is selected.
+                                // Get the current app theme status.
+                                val currentAppThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
+
+                                // Check if the current app theme is dark.
+                                currentAppThemeStatus == Configuration.UI_MODE_NIGHT_YES
+                            }
+                        }
+                    } else {  // Algorithmic darkening is not supported.
+                        false
+                    }
+
+                    // Set the WebView theme int.
+                    val webViewThemeInt = if (webViewDarkThemeCurrentlyEnabled == defaultWebViewDarkThemeEnabled)  // The current WebView theme matches the default.
+                        SYSTEM_DEFAULT
+                    else if (webViewDarkThemeCurrentlyEnabled)  // The current WebView theme is dark and that is not the default.
+                        DARK_THEME
+                    else  // The current WebView theme is light and that is not the default.
+                        LIGHT_THEME
+
                     // Create the domain and store the database ID.
-                    val newDomainDatabaseId = domainsDatabaseHelper!!.addDomain(currentDomain)
+                    val newDomainDatabaseId = domainsDatabaseHelper!!.addDomain(currentDomain, javaScriptInt, cookiesInt, domStorageInt, userAgentName, easyListInt, easyPrivacyInt,
+                                                                                fanboysAnnoyanceListInt, fanboysSocialBlockingListInt, ultraListInt, ultraPrivacyInt, blockAllThirdPartyRequestsInt, fontSizeInt,
+                                                                                swipeToRefreshInt, webViewThemeInt, wideViewportInt, displayImagesInt)
 
                     // Create an intent to launch the domains activity.
                     val domainsIntent = Intent(this, DomainsActivity::class.java)
@@ -2058,7 +2162,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     // Add the extra information to the intent.
                     domainsIntent.putExtra(LOAD_DOMAIN, newDomainDatabaseId)
                     domainsIntent.putExtra(CLOSE_ON_BACK, true)
-                    domainsIntent.putExtra(CURRENT_URL, currentWebView!!.url)
                     domainsIntent.putExtra(CURRENT_IP_ADDRESSES, currentWebView!!.currentIpAddresses)
 
                     // Get the current certificate.
@@ -2118,34 +2221,25 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             R.id.back -> {  // Back.
                 // Check if the WebView can go back.
                 if (currentWebView!!.canGoBack()) {
-                    // Get the current web back forward list.
-                    val webBackForwardList = currentWebView!!.copyBackForwardList()
-
-                    // Get the previous entry URL.
-                    val previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.currentIndex - 1).url
-
-                    // Apply the domain settings.
-                    applyDomainSettings(currentWebView!!, previousUrl, resetTab = false, reloadWebsite = false, loadUrl = false)
-
-                    // Load the previous website in the history.
-                    currentWebView!!.goBack()
+                    // Navigate back one page.
+                    navigateHistory(-1)
                 }
             }
 
             R.id.forward -> {  // Forward.
                 // Check if the WebView can go forward.
                 if (currentWebView!!.canGoForward()) {
-                    // Get the current web back forward list.
-                    val webBackForwardList = currentWebView!!.copyBackForwardList()
-
-                    // Get the next entry URL.
-                    val nextUrl = webBackForwardList.getItemAtIndex(webBackForwardList.currentIndex + 1).url
-
-                    // Apply the domain settings.
-                    applyDomainSettings(currentWebView!!, nextUrl, resetTab = false, reloadWebsite = false, loadUrl = false)
+                    // Navigate forward one page.
+                    navigateHistory(+1)
+                }
+            }
 
-                    // Load the next website in the history.
-                    currentWebView!!.goForward()
+            R.id.scroll_to_bottom -> {  // Scroll to Bottom.
+                // Check if the WebView is scrolled to the top.
+                if (currentWebView!!.scrollY == 0) {  // The WebView is at the top; scroll to the bottom.  Using a large Y number is more efficient than trying to calculate the exact WebView length.
+                    currentWebView!!.scrollTo(0, 1_000_000_000)
+                } else {  // The WebView is not at the top; scroll to the top.
+                    currentWebView!!.scrollTo(0, 0)
                 }
             }
 
@@ -2234,7 +2328,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 val domainsIntent = Intent(this, DomainsActivity::class.java)
 
                 // Add the extra information to the intent.
-                domainsIntent.putExtra(CURRENT_URL, currentWebView!!.url)
                 domainsIntent.putExtra(CURRENT_IP_ADDRESSES, currentWebView!!.currentIpAddresses)
 
                 // Get the current certificate.
@@ -2318,11 +2411,11 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // Create an intent to launch the about activity.
                 val aboutIntent = Intent(this, AboutActivity::class.java)
 
-                // Create a string array for the blocklist versions.
-                val blocklistVersions = arrayOf(easyList[0][0][0], easyPrivacy[0][0][0], fanboysAnnoyanceList[0][0][0], fanboysSocialList[0][0][0], ultraList[0][0][0], ultraPrivacy!![0][0][0])
+                // Create a string array for the filter list versions.
+                val filterListVersions = arrayOf(easyList[0][0][0], easyPrivacy[0][0][0], fanboysAnnoyanceList[0][0][0], fanboysSocialList[0][0][0], ultraList[0][0][0], ultraPrivacy!![0][0][0])
 
-                // Add the blocklist versions to the intent.
-                aboutIntent.putExtra(AboutActivity.BLOCKLIST_VERSIONS, blocklistVersions)
+                // Add the filter list versions to the intent.
+                aboutIntent.putExtra(FILTERLIST_VERSIONS, filterListVersions)
 
                 // Make it so.
                 startActivity(aboutIntent)
@@ -2336,15 +2429,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         return true
     }
 
-    public override fun onPostCreate(savedInstanceState: Bundle?) {
-        // Run the default commands.
-        super.onPostCreate(savedInstanceState)
-
-        // Sync the state of the DrawerToggle after the default `onRestoreInstanceState()` has finished.  This creates the navigation drawer icon.
-        // If the app is restarting to change the app theme the action bar drawer toggle will not yet be populated.
-        actionBarDrawerToggle?.syncState()
-    }
-
     override fun onCreateContextMenu(contextMenu: ContextMenu, view: View, contextMenuInfo: ContextMenu.ContextMenuInfo?) {
         // Get the hit test result.
         val hitTestResult = currentWebView!!.hitTestResult
@@ -2369,7 +2453,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // Add an open in new tab entry.
                 contextMenu.add(R.string.open_in_new_tab).setOnMenuItemClickListener {
                     // Load the link URL in a new tab and move to it.
-                    addNewTab(linkUrl, true)
+                    addNewPage(linkUrl, adjacent = true, moveToTab = true)
 
                     // Consume the event.
                     true
@@ -2378,7 +2462,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // Add an open in background entry.
                 contextMenu.add(R.string.open_in_background).setOnMenuItemClickListener {
                     // Load the link URL in a new tab but do not move to it.
-                    addNewTab(linkUrl, false)
+                    addNewPage(linkUrl, adjacent = true, moveToTab = false)
 
                     // Consume the event.
                     true
@@ -2418,7 +2502,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 contextMenu.add(R.string.save_url).setOnMenuItemClickListener {
                     // Check the download preference.
                     if (downloadWithExternalApp)  // Download with an external app.
-                        downloadUrlWithExternalApp(linkUrl)
+                        saveWithExternalApp(linkUrl)
                     else  // Handle the download inside of Privacy Browser.  The dialog will be displayed once the file size and the content disposition have been acquired.
                         PrepareSaveDialogCoroutine.prepareSaveDialog(this, supportFragmentManager, linkUrl, currentWebView!!.settings.userAgentString, currentWebView!!.acceptCookies)
 
@@ -2426,6 +2510,27 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     true
                 }
 
+                // Add a Share URL entry.
+                contextMenu.add(R.string.share_url).setOnMenuItemClickListener {
+                    // Create the share intent.
+                    val shareUrlIntent = Intent(Intent.ACTION_SEND)
+
+                    // Add the URL to the intent.
+                    shareUrlIntent.putExtra(Intent.EXTRA_TEXT, linkUrl)
+
+                    // Set the MIME type.
+                    shareUrlIntent.type = "text/plain"
+
+                    // Set the intent to open in a new task.
+                    shareUrlIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+
+                    //Make it so.
+                    startActivity(Intent.createChooser(shareUrlIntent, getString(R.string.share_url)))
+
+                    // Consume the event.
+                    true
+                }
+
                 // Add an empty cancel entry, which by default closes the context menu.
                 contextMenu.add(R.string.cancel)
             }
@@ -2444,7 +2549,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // Add an open in new tab entry.
                 contextMenu.add(R.string.open_image_in_new_tab).setOnMenuItemClickListener {
                     // Load the image in a new tab.
-                    addNewTab(imageUrl, true)
+                    addNewPage(imageUrl, adjacent = true, moveToTab = true)
 
                     // Consume the event.
                     true
@@ -2481,7 +2586,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 contextMenu.add(R.string.save_image).setOnMenuItemClickListener {
                     // Check the download preference.
                     if (downloadWithExternalApp) {  // Download with an external app.
-                        downloadUrlWithExternalApp(imageUrl)
+                        saveWithExternalApp(imageUrl)
                     } else {  // Handle the download inside of Privacy Browser.  The dialog will be displayed once the file size and the content disposition have been acquired.
                         PrepareSaveDialogCoroutine.prepareSaveDialog(this, supportFragmentManager, imageUrl, currentWebView!!.settings.userAgentString, currentWebView!!.acceptCookies)
                     }
@@ -2502,6 +2607,27 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     true
                 }
 
+                // Add a Share URL entry.
+                contextMenu.add(R.string.share_url).setOnMenuItemClickListener {
+                    // Create the share intent.
+                    val shareUrlIntent = Intent(Intent.ACTION_SEND)
+
+                    // Add the URL to the intent.
+                    shareUrlIntent.putExtra(Intent.EXTRA_TEXT, imageUrl)
+
+                    // Set the MIME type.
+                    shareUrlIntent.type = "text/plain"
+
+                    // Set the intent to open in a new task.
+                    shareUrlIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+
+                    //Make it so.
+                    startActivity(Intent.createChooser(shareUrlIntent, getString(R.string.share_url)))
+
+                    // Consume the event.
+                    true
+                }
+
                 // Add an empty cancel entry, which by default closes the context menu.
                 contextMenu.add(R.string.cancel)
             }
@@ -2529,7 +2655,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // Add an open in new tab entry.
                 contextMenu.add(R.string.open_in_new_tab).setOnMenuItemClickListener {
                     // Load the link URL in a new tab and move to it.
-                    addNewTab(linkUrl, true)
+                    addNewPage(linkUrl, adjacent = true, moveToTab = true)
 
                     // Consume the event.
                     true
@@ -2538,7 +2664,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // Add an open in background entry.
                 contextMenu.add(R.string.open_in_background).setOnMenuItemClickListener {
                     // Lod the link URL in a new tab but do not move to it.
-                    addNewTab(linkUrl, false)
+                    addNewPage(linkUrl, adjacent = true, moveToTab = false)
 
                     // Consume the event.
                     true
@@ -2547,7 +2673,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // Add an open image in new tab entry.
                 contextMenu.add(R.string.open_image_in_new_tab).setOnMenuItemClickListener {
                     // Load the image in a new tab and move to it.
-                    addNewTab(imageUrl, true)
+                    addNewPage(imageUrl, adjacent = true, moveToTab = true)
 
                     // Consume the event.
                     true
@@ -2584,7 +2710,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 contextMenu.add(R.string.save_image).setOnMenuItemClickListener {
                     // Check the download preference.
                     if (downloadWithExternalApp)  // Download with an external app.
-                        downloadUrlWithExternalApp(imageUrl)
+                        saveWithExternalApp(imageUrl)
                     else  // Handle the download inside of Privacy Browser.  The dialog will be displayed once the file size and the content disposition have been acquired.
                         PrepareSaveDialogCoroutine.prepareSaveDialog(this, supportFragmentManager, imageUrl, currentWebView!!.settings.userAgentString, currentWebView!!.acceptCookies)
 
@@ -2592,6 +2718,27 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     true
                 }
 
+                // Add a Share Image entry.
+                contextMenu.add(R.string.share_image).setOnMenuItemClickListener {
+                    // Create the share intent.
+                    val shareUrlIntent = Intent(Intent.ACTION_SEND)
+
+                    // Add the URL to the intent.
+                    shareUrlIntent.putExtra(Intent.EXTRA_TEXT, imageUrl)
+
+                    // Set the MIME type.
+                    shareUrlIntent.type = "text/plain"
+
+                    // Set the intent to open in a new task.
+                    shareUrlIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+
+                    //Make it so.
+                    startActivity(Intent.createChooser(shareUrlIntent, getString(R.string.share_url)))
+
+                    // Consume the event.
+                    true
+                }
+
                 // Add a copy URL entry.
                 contextMenu.add(R.string.copy_url).setOnMenuItemClickListener {
                     // Save the link URL in a clip data.
@@ -2608,7 +2755,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 contextMenu.add(R.string.save_url).setOnMenuItemClickListener {
                     // Check the download preference.
                     if (downloadWithExternalApp)  // Download with an external app.
-                        downloadUrlWithExternalApp(linkUrl)
+                        saveWithExternalApp(linkUrl)
                     else  // Handle the download inside of Privacy Browser.  The dialog will be displayed once the file size and the content disposition have been acquired.
                         PrepareSaveDialogCoroutine.prepareSaveDialog(this, supportFragmentManager, linkUrl, currentWebView!!.settings.userAgentString, currentWebView!!.acceptCookies)
 
@@ -2616,6 +2763,27 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                     true
                 }
 
+                // Add a Share URL entry.
+                contextMenu.add(R.string.share_url).setOnMenuItemClickListener {
+                    // Create the share intent.
+                    val shareUrlIntent = Intent(Intent.ACTION_SEND)
+
+                    // Add the URL to the intent.
+                    shareUrlIntent.putExtra(Intent.EXTRA_TEXT, linkUrl)
+
+                    // Set the MIME type.
+                    shareUrlIntent.type = "text/plain"
+
+                    // Set the intent to open in a new task.
+                    shareUrlIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+
+                    //Make it so.
+                    startActivity(Intent.createChooser(shareUrlIntent, getString(R.string.share_url)))
+
+                    // Consume the event.
+                    true
+                }
+
                 // Add an empty cancel entry, which by default closes the context menu.
                 contextMenu.add(R.string.cancel)
             }
@@ -2668,3239 +2836,3414 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         }
     }
 
-    override fun onCreateBookmark(dialogFragment: DialogFragment, favoriteIconBitmap: Bitmap) {
-        // Get the dialog.
-        val dialog = dialogFragment.dialog!!
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun addTab(@Suppress("UNUSED_PARAMETER")view: View?) {
+        // Add a new tab with a blank URL.
+        addNewPage(urlString = "", adjacent = true, moveToTab = true)
+    }
 
-        // Get the views from the dialog fragment.
-        val createBookmarkNameEditText = dialog.findViewById<EditText>(R.id.create_bookmark_name_edittext)
-        val createBookmarkUrlEditText = dialog.findViewById<EditText>(R.id.create_bookmark_url_edittext)
+    private fun addNewPage(urlString: String, adjacent: Boolean, moveToTab: Boolean) {
+        // Clear the focus from the URL edit text, so that it will be populated with the information from the new tab.
+        urlEditText.clearFocus()
 
-        // Extract the strings from the edit texts.
-        val bookmarkNameString = createBookmarkNameEditText.text.toString()
-        val bookmarkUrlString = createBookmarkUrlEditText.text.toString()
+        // Add the new tab after the tab layout has quiesced.
+        // Otherwise, there can be problems when restoring a large number of tabs and processing a new intent at the same time.  <https://redmine.stoutner.com/issues/1136>
+        tabLayout.post {
+            // Get the new tab position.
+            val newTabPosition = if (adjacent)  // The new tab position is immediately to the right of the current tab position.
+                tabLayout.selectedTabPosition + 1
+            else  // The new tab position is at the end.  The tab positions are 0 indexed, so the new page number will match the current count.
+                tabLayout.tabCount
 
-        // Create a favorite icon byte array output stream.
-        val favoriteIconByteArrayOutputStream = ByteArrayOutputStream()
+            // Add the new WebView page.
+            webViewStateAdapter!!.addPage(newTabPosition, urlString)
 
-        // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
-        favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream)
+            // Add the new tab.
+            addNewTab(newTabPosition, moveToTab)
+        }
+    }
 
-        // Convert the favorite icon byte array stream to a byte array.
-        val favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray()
+    private fun addNewTab(newTabPosition: Int, moveToTab: Boolean) {
+        // Check to see if the new page is ready.
+        if (webViewStateAdapter!!.itemCount >= tabLayout.tabCount) {  // The new page is ready.
+            // Create a new tab.
+            val newTab = tabLayout.newTab()
 
-        // Display the new bookmark below the current items in the (0 indexed) list.
-        val newBookmarkDisplayOrder = bookmarksListView.count
+            // Set a custom view on the new tab.
+            newTab.setCustomView(R.layout.tab_custom_view)
 
-        // Create the bookmark.
-        bookmarksDatabaseHelper!!.createBookmark(bookmarkNameString, bookmarkUrlString, currentBookmarksFolder, newBookmarkDisplayOrder, favoriteIconByteArray)
+            // Add the new tab.
+            tabLayout.addTab(newTab, newTabPosition, moveToTab)
 
-        // Update the bookmarks cursor with the current contents of this folder.
-        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolder)
+            // Select the new tab if it is the first one.  For some odd reason, Android doesn't select the first tab if it is the only one, which causes problems with the new tab position logic above.
+            if (newTabPosition == 0)
+                tabLayout.selectTab(newTab)
 
-        // Update the list view.
-        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
-
-        // Scroll to the new bookmark.
-        bookmarksListView.setSelection(newBookmarkDisplayOrder)
-    }
-
-    override fun onCreateBookmarkFolder(dialogFragment: DialogFragment, favoriteIconBitmap: Bitmap) {
-        // Get the dialog.
-        val dialog = dialogFragment.dialog!!
-
-        // Get handles for the views in the dialog fragment.
-        val folderNameEditText = dialog.findViewById<EditText>(R.id.folder_name_edittext)
-        val defaultIconRadioButton = dialog.findViewById<RadioButton>(R.id.default_icon_radiobutton)
-        val defaultIconImageView = dialog.findViewById<ImageView>(R.id.default_icon_imageview)
+            // Scroll to the new tab position if moving to the new tab.
+            if (moveToTab)
+                tabLayout.post {
+                    tabLayout.setScrollPosition(newTabPosition, 0F, false, false)
+                }
 
-        // Get new folder name string.
-        val folderNameString = folderNameEditText.text.toString()
+            // Show the app bar if it is at the bottom of the screen and the new tab is taking focus.
+            if (bottomAppBar && moveToTab && appBarLayout.translationY != 0f) {
+                // Animate the bottom app bar onto the screen.
+                objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", 0f)
 
-        // Set the folder icon bitmap according to the dialog.
-        val folderIconBitmap: Bitmap = if (defaultIconRadioButton.isChecked) {  // Use the default folder icon.
-            // Get the default folder icon drawable.
-            val folderIconDrawable = defaultIconImageView.drawable
+                // Make it so.
+                objectAnimator.start()
+            }
+        } else {  // The new page is not ready.
+            // Create a new tab handler.
+            val newTabHandler = Handler(Looper.getMainLooper())
 
-            // Convert the folder icon drawable to a bitmap drawable.
-            val folderIconBitmapDrawable = folderIconDrawable as BitmapDrawable
+            // Create a new tab runnable.
+            val newTabRunnable = Runnable {
+                // Create the new tab.
+                addNewTab(newTabPosition, moveToTab)
+            }
 
-            // Convert the folder icon bitmap drawable to a bitmap.
-            folderIconBitmapDrawable.bitmap
-        } else {  // Use the WebView favorite icon.
-            // Copy the favorite icon bitmap to the folder icon bitmap.
-            favoriteIconBitmap
+            // Try adding the new tab again after 50 milliseconds.
+            newTabHandler.postDelayed(newTabRunnable, 50)
         }
+    }
 
-        // Create a folder icon byte array output stream.
-        val folderIconByteArrayOutputStream = ByteArrayOutputStream()
+    private fun applyAppSettings() {
+        // Store the default preferences used in `applyDomainSettings()`.  These are done here so that expensive preference requests are not done each time a domain is loaded.
+        defaultJavaScript = sharedPreferences.getBoolean(getString(R.string.javascript_key), false)
+        defaultCookies = sharedPreferences.getBoolean(getString(R.string.cookies_key), false)
+        defaultDomStorage = sharedPreferences.getBoolean(getString(R.string.dom_storage_key), false)
+        defaultEasyList = sharedPreferences.getBoolean(getString(R.string.easylist_key), true)
+        defaultEasyPrivacy = sharedPreferences.getBoolean(getString(R.string.easyprivacy_key), true)
+        defaultFanboysAnnoyanceList = sharedPreferences.getBoolean(getString(R.string.fanboys_annoyance_list_key), true)
+        defaultFanboysSocialBlockingList = sharedPreferences.getBoolean(getString(R.string.fanboys_social_blocking_list_key), true)
+        defaultUltraList = sharedPreferences.getBoolean(getString(R.string.ultralist_key), true)
+        defaultUltraPrivacy = sharedPreferences.getBoolean(getString(R.string.ultraprivacy_key), true)
+        defaultBlockAllThirdPartyRequests = sharedPreferences.getBoolean(getString(R.string.block_all_third_party_requests_key), false)
+        defaultFontSizeString = sharedPreferences.getString(getString(R.string.font_size_key), getString(R.string.font_size_default_value))!!
+        defaultUserAgentName = sharedPreferences.getString(getString(R.string.user_agent_key), getString(R.string.user_agent_default_value))!!
+        defaultSwipeToRefresh = sharedPreferences.getBoolean(getString(R.string.swipe_to_refresh_key), true)
+        defaultWebViewTheme = sharedPreferences.getString(getString(R.string.webview_theme_key), getString(R.string.webview_theme_default_value))!!
+        defaultWideViewport = sharedPreferences.getBoolean(getString(R.string.wide_viewport_key), true)
+        defaultDisplayWebpageImages = sharedPreferences.getBoolean(getString(R.string.display_webpage_images_key), true)
+
+        // Get the string arrays.  These are done here so that expensive resource requests are not made each time a domain is loaded.
+        webViewThemeEntryValuesStringArray = resources.getStringArray(R.array.webview_theme_entry_values)
+        userAgentDataArray = resources.getStringArray(R.array.user_agent_data)
+        userAgentNamesArray = resources.getStringArray(R.array.user_agent_names)
+        val downloadProviderEntryValuesStringArray = resources.getStringArray(R.array.download_provider_entry_values)
+
+        // Get the user agent array adapters.  These are done here so that expensive resource requests are not made each time a domain is loaded.
+        userAgentDataArrayAdapter = ArrayAdapter.createFromResource(this, R.array.user_agent_data, R.layout.spinner_item)
+        userAgentNamesArrayAdapter = ArrayAdapter.createFromResource(this, R.array.user_agent_names, R.layout.spinner_item)
 
-        // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
-        folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream)
+        // Store the values from the shared preferences in variables.
+        incognitoModeEnabled = sharedPreferences.getBoolean(getString(R.string.incognito_mode_key), false)
+        sanitizeTrackingQueries = sharedPreferences.getBoolean(getString(R.string.tracking_queries_key), true)
+        sanitizeAmpRedirects = sharedPreferences.getBoolean(getString(R.string.amp_redirects_key), true)
+        proxyMode = sharedPreferences.getString(getString(R.string.proxy_key), getString(R.string.proxy_default_value))!!
+        fullScreenBrowsingModeEnabled = sharedPreferences.getBoolean(getString(R.string.full_screen_browsing_mode_key), false)
+        hideAppBar = sharedPreferences.getBoolean(getString(R.string.hide_app_bar_key), true)
+        val downloadProvider = sharedPreferences.getString(getString(R.string.download_provider_key), getString(R.string.download_provider_default_value))!!
+        scrollAppBar = sharedPreferences.getBoolean(getString(R.string.scroll_app_bar_key), false)
 
-        // Convert the folder icon byte array stream to a byte array.
-        val folderIconByteArray = folderIconByteArrayOutputStream.toByteArray()
+        // Determine if downloading should be handled by an external app.
+        downloadWithExternalApp = (downloadProvider == downloadProviderEntryValuesStringArray[2])
 
-        // Move all the bookmarks down one in the display order.
-        for (i in 0 until bookmarksListView.count) {
-            // Get the bookmark database id.
-            val databaseId = bookmarksListView.getItemIdAtPosition(i).toInt()
+        // Apply the saved proxy mode if the app has been restarted.
+        if (savedProxyMode != null) {
+            // Apply the saved proxy mode.
+            proxyMode = savedProxyMode!!
 
-            // Move the bookmark down one slot.
-            bookmarksDatabaseHelper!!.updateDisplayOrder(databaseId, i + 1)
+            // Reset the saved proxy mode.
+            savedProxyMode = null
         }
 
-        // Create the folder, which will be placed at the top of the list view.
-        bookmarksDatabaseHelper!!.createFolder(folderNameString, currentBookmarksFolder, folderIconByteArray)
-
-        // Update the bookmarks cursor with the current contents of this folder.
-        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolder)
-
-        // Update the list view.
-        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
+        // Get the search string.
+        val searchString = sharedPreferences.getString(getString(R.string.search_key), getString(R.string.search_default_value))!!
 
-        // Scroll to the new folder.
-        bookmarksListView.setSelection(0)
-    }
+        // Set the search string, using the custom search URL if specified.
+        searchURL = if (searchString == getString(R.string.custom_url_item))
+            sharedPreferences.getString(getString(R.string.search_custom_url_key), getString(R.string.search_custom_url_default_value))!!
+        else
+            searchString
 
-    private fun loadUrlFromTextBox() {
-        // Get the text from URL text box and convert it to a string.  trim() removes white spaces from the beginning and end of the string.
-        var unformattedUrlString = urlEditText.text.toString().trim { it <= ' ' }
+        // Apply the proxy.
+        applyProxy(false)
 
-        // Create the formatted URL string.
-        var urlString = ""
+        // Adjust the layout and scrolling parameters according to the position of the app bar.
+        if (bottomAppBar) {  // The app bar is on the bottom.
+            // Adjust the UI.
+            if (scrollAppBar || (inFullScreenBrowsingMode && hideAppBar)) {  // The app bar scrolls or full screen browsing mode is engaged with the app bar hidden.
+                // Reset the WebView padding to fill the available space.
+                swipeRefreshLayout.setPadding(0, 0, 0, 0)
+            } else {  // The app bar doesn't scroll or full screen browsing mode is not engaged with the app bar hidden.
+                // Move the WebView above the app bar layout.
+                swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
 
-        // Check to see if the unformatted URL string is a valid URL.  Otherwise, convert it into a search.
-        if (unformattedUrlString.startsWith("content://")) {  // This is a content URL.
-            // Load the entire content URL.
-            urlString = unformattedUrlString
-        } else if (Patterns.WEB_URL.matcher(unformattedUrlString).matches() || unformattedUrlString.startsWith("http://") || unformattedUrlString.startsWith("https://") ||
-            unformattedUrlString.startsWith("file://")) {  // This is a standard URL.
+                // Show the app bar if it is scrolled off the screen.
+                if (appBarLayout.translationY != 0f) {
+                    // Animate the bottom app bar onto the screen.
+                    objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", 0f)
 
-            // Add `https://` at the beginning if there is no protocol.  Otherwise the app will segfault.
-            if (!unformattedUrlString.startsWith("http") && !unformattedUrlString.startsWith("file://"))
-                unformattedUrlString = "https://$unformattedUrlString"
+                    // Make it so.
+                    objectAnimator.start()
+                }
+            }
+        } else {  // The app bar is on the top.
+            // Get the current layout parameters.  Using coordinator layout parameters allows the `setBehavior()` command and using app bar layout parameters allows the `setScrollFlags()` command.
+            val swipeRefreshLayoutParams = swipeRefreshLayout.layoutParams as CoordinatorLayout.LayoutParams
+            val toolbarLayoutParams = toolbar.layoutParams as AppBarLayout.LayoutParams
+            val findOnPageLayoutParams = findOnPageLinearLayout.layoutParams as AppBarLayout.LayoutParams
+            val tabsLayoutParams = tabsLinearLayout.layoutParams as AppBarLayout.LayoutParams
 
-            // Initialize the unformatted URL.
-            var unformattedUrl: URL? = null
+            // Add the scrolling behavior to the layout parameters.
+            if (scrollAppBar) {
+                // Enable scrolling of the app bar.
+                swipeRefreshLayoutParams.behavior = AppBarLayout.ScrollingViewBehavior()
+                toolbarLayoutParams.scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL or AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS or AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP
+                findOnPageLayoutParams.scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL or AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS or AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP
+                tabsLayoutParams.scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL or AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS or AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP
+            } else {
+                // Disable scrolling of the app bar.
+                swipeRefreshLayoutParams.behavior = null
+                toolbarLayoutParams.scrollFlags = 0
+                findOnPageLayoutParams.scrollFlags = 0
+                tabsLayoutParams.scrollFlags = 0
 
-            // Convert the unformatted URL string to a URL.
-            try {
-                unformattedUrl = URL(unformattedUrlString)
-            } catch (exception: MalformedURLException) {
-                exception.printStackTrace()
+                // Expand the app bar if it is currently collapsed.
+                appBarLayout.setExpanded(true)
             }
 
-            // Get the components of the URL.
-            val scheme = unformattedUrl?.protocol
-            val authority = unformattedUrl?.authority
-            val path = unformattedUrl?.path
-            val query = unformattedUrl?.query
-            val fragment = unformattedUrl?.ref
+            // Set the app bar scrolling for each WebView.
+            for (i in 0 until webViewStateAdapter!!.itemCount) {
+                // Get the WebView tab fragment.
+                val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
-            // Create a URI.
-            val uri = Uri.Builder()
+                // Get the fragment view.
+                val fragmentView = webViewTabFragment.view
 
-            // Build the URI from the components of the URL.
-            uri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment)
+                // Only modify the WebViews if they exist.
+                if (fragmentView != null) {
+                    // Get the nested scroll WebView from the tab fragment.
+                    val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
 
-            // Decode the URI as a UTF-8 string in.
-            try {
-                urlString = URLDecoder.decode(uri.build().toString(), "UTF-8")
-            } catch (exception: UnsupportedEncodingException) {
-                // Do nothing.  The formatted URL string will remain blank.
-            }
-        } else if (unformattedUrlString.isNotEmpty()) {  // This is not a URL, but rather a search string.
-            // Sanitize the search input.
-            val encodedSearchString = try {
-                URLEncoder.encode(unformattedUrlString, "UTF-8")
-            } catch (exception: UnsupportedEncodingException) {
-                ""
+                    // Set the app bar scrolling.
+                    nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
+                }
             }
-
-            // Add the base search URL.
-            urlString = searchURL + encodedSearchString
         }
 
-        // Clear the focus from the URL edit text.  Otherwise, proximate typing in the box will retain the colorized formatting instead of being reset during refocus.
-        urlEditText.clearFocus()
+        // Update the full screen browsing mode settings.
+        if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {  // Privacy Browser is currently in full screen browsing mode.
+            // Update the visibility of the app bar, which might have changed in the settings.
+            if (hideAppBar) {
+                // Hide the tab linear layout.
+                tabsLinearLayout.visibility = View.GONE
 
-        // Make it so.
-        loadUrl(currentWebView!!, urlString)
-    }
+                // Hide the app bar.
+                appBar.hide()
+            } else {
+                // Show the tab linear layout.
+                tabsLinearLayout.visibility = View.VISIBLE
 
-    private fun loadUrl(nestedScrollWebView: NestedScrollWebView, url: String) {
-        // Sanitize the URL.
-        val urlString = sanitizeUrl(url)
+                // Show the app bar.
+                appBar.show()
+            }
 
-        // Apply the domain settings and load the URL.
-        applyDomainSettings(nestedScrollWebView, urlString, resetTab = true, reloadWebsite = false, loadUrl = true)
-    }
+            /* Hide the system bars.
+             * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+             * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+             */
 
-    // The view parameter cannot be removed because it is called from the layout onClick.
-    fun findPreviousOnPage(@Suppress("UNUSED_PARAMETER")view: View?) {
-        // Go to the previous highlighted phrase on the page.  `false` goes backwards instead of forwards.
-        currentWebView!!.findNext(false)
-    }
+            // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+            @Suppress("DEPRECATION")
+            rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+        } else {  // Privacy Browser is not in full screen browsing mode.
+            // Reset the full screen tracker, which could be true if Privacy Browser was in full screen mode before entering settings and full screen browsing was disabled.
+            inFullScreenBrowsingMode = false
 
-    // The view parameter cannot be removed because it is called from the layout onClick.
-    fun findNextOnPage(@Suppress("UNUSED_PARAMETER")view: View?) {
-        // Go to the next highlighted phrase on the page. `true` goes forwards instead of backwards.
-        currentWebView!!.findNext(true)
-    }
+            // Show the tab linear layout.
+            tabsLinearLayout.visibility = View.VISIBLE
 
-    // The view parameter cannot be removed because it is called from the layout onClick.
-    fun closeFindOnPage(@Suppress("UNUSED_PARAMETER")view: View?) {
-        // Delete the contents of the find on page edit text.
-        findOnPageEditText.text = null
+            // Show the app bar.
+            appBar.show()
 
-        // Clear the highlighted phrases if the WebView is not null.
-        currentWebView?.clearMatches()
+            // Remove the `SYSTEM_UI` flags from the root frame layout.  The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+            @Suppress("DEPRECATION")
+            rootFrameLayout.systemUiVisibility = 0
+        }
+    }
 
-        // Hide the find on page linear layout.
-        findOnPageLinearLayout.visibility = View.GONE
+    // `reloadWebsite` is used if returning from the Domains activity.  Otherwise JavaScript might not function correctly if it is newly enabled.
+    @SuppressLint("SetJavaScriptEnabled")
+    private fun applyDomainSettings(nestedScrollWebView: NestedScrollWebView, url: String?, resetTab: Boolean, reloadWebsite: Boolean, loadUrl: Boolean) {
+        // Store the current URL.
+        nestedScrollWebView.currentUrl = url!!
 
-        // Show the toolbar.
-        toolbar.visibility = View.VISIBLE
+        // Parse the URL into a URI.
+        val uri = Uri.parse(url)
 
-        // Get a handle for the input method manager.
-        val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
+        // Extract the domain from the URI.
+        var newHostName = uri.host
 
-        // Hide the keyboard.
-        inputMethodManager.hideSoftInputFromWindow(toolbar.windowToken, 0)
-    }
+        // Strings don't like to be null.
+        if (newHostName == null)
+            newHostName = ""
 
-    override fun onApplyNewFontSize(dialogFragment: DialogFragment) {
-        // Get the dialog.
-        val dialog = dialogFragment.dialog!!
+        // Apply the domain settings if a new domain is being loaded or if the new domain is blank.  This allows the user to set temporary settings for JavaScript, cookies, DOM storage, etc.
+        if ((nestedScrollWebView.currentDomainName != newHostName) || (newHostName == "")) {  // A new domain is being loaded.
+            // Set the new host name as the current domain name.
+            nestedScrollWebView.currentDomainName = newHostName
 
-        // Get a handle for the font size edit text.
-        val fontSizeEditText = dialog.findViewById<EditText>(R.id.font_size_edittext)
-
-        // Initialize the new font size variable with the current font size.
-        var newFontSize = currentWebView!!.settings.textZoom
+            // Reset the ignoring of pinned domain information.
+            nestedScrollWebView.ignorePinnedDomainInformation = false
 
-        // Get the font size from the edit text.
-        try {
-            newFontSize = fontSizeEditText.text.toString().toInt()
-        } catch (exception: Exception) {
-            // If the edit text does not contain a valid font size do nothing.
-        }
+            // Clear any pinned SSL certificate or IP addresses.
+            nestedScrollWebView.clearPinnedSslCertificate()
+            nestedScrollWebView.pinnedIpAddresses = ""
 
-        // Apply the new font size.
-        currentWebView!!.settings.textZoom = newFontSize
-    }
+            // Reset the tab if specified.
+            if (resetTab) {
+                // Initialize the favorite icon.
+                nestedScrollWebView.resetFavoriteIcon()
 
-    override fun onOpen(dialogFragment: DialogFragment) {
-        // Get the dialog.
-        val dialog = dialogFragment.dialog!!
+                // Get the current page position.
+                val currentPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-        // Get handles for the views.
-        val fileNameEditText = dialog.findViewById<EditText>(R.id.file_name_edittext)
-        val mhtCheckBox = dialog.findViewById<CheckBox>(R.id.mht_checkbox)
+                // Get the corresponding tab.
+                val tab = tabLayout.getTabAt(currentPagePosition)
 
-        // Get the file path string.
-        val openFilePath = fileNameEditText.text.toString()
+                // Update the tab if it isn't null, which sometimes happens when restarting from the background.
+                if (tab != null) {
+                    // Get the tab custom view.
+                    val tabCustomView = tab.customView!!
 
-        // Apply the domain settings.  This resets the favorite icon and removes any domain settings.
-        applyDomainSettings(currentWebView!!, openFilePath, resetTab = true, reloadWebsite = false, loadUrl = false)
+                    // Get the tab views.
+                    val tabFavoriteIconImageView = tabCustomView.findViewById<ImageView>(R.id.favorite_icon_imageview)
+                    val tabTitleTextView = tabCustomView.findViewById<TextView>(R.id.title_textview)
 
-        // Open the file according to the type.
-        if (mhtCheckBox.isChecked) {  // Force opening of an MHT file.
-            try {
-                // Get the MHT file input stream.
-                val mhtFileInputStream = contentResolver.openInputStream(Uri.parse(openFilePath))
+                    // Store the current values in case they need to be restored.
+                    nestedScrollWebView.previousFavoriteIconDrawable = tabFavoriteIconImageView.drawable
+                    nestedScrollWebView.previousWebpageTitle = tabTitleTextView.text.toString()
 
-                // Create a temporary MHT file.
-                val temporaryMhtFile = File.createTempFile(TEMPORARY_MHT_FILE, ".mht", cacheDir)
+                    // Set the default favorite icon as the favorite icon for this tab.
+                    tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(nestedScrollWebView.getFavoriteIcon(), 64, 64, true))
 
-                // Get a file output stream for the temporary MHT file.
-                val temporaryMhtFileOutputStream = FileOutputStream(temporaryMhtFile)
+                    // Set the loading title text.
+                    tabTitleTextView.setText(R.string.loading)
+                }
+            }
 
-                // Create a transfer byte array.
-                val transferByteArray = ByteArray(1024)
+            // Initialize the domain name in database variable.
+            var domainNameInDatabase: String? = null
 
-                // Create an integer to track the number of bytes read.
-                var bytesRead: Int
+            // Check the hostname against the domain settings set.
+            if (domainsSettingsSet.contains(newHostName)) {  // The hostname is contained in the domain settings set.
+                // Record the domain name in the database.
+                domainNameInDatabase = newHostName
 
-                // Copy the temporary MHT file input stream to the MHT output stream.
-                while (mhtFileInputStream!!.read(transferByteArray).also { bytesRead = it } > 0)
-                    temporaryMhtFileOutputStream.write(transferByteArray, 0, bytesRead)
+                // Set the domain settings applied tracker to true.
+                nestedScrollWebView.domainSettingsApplied = true
+            } else {  // The hostname is not contained in the domain settings set.
+                // Set the domain settings applied tracker to false.
+                nestedScrollWebView.domainSettingsApplied = false
+            }
 
-                // Flush the temporary MHT file output stream.
-                temporaryMhtFileOutputStream.flush()
+            // Check all the subdomains of the host name against wildcard domains in the domain cursor.
+            while (!nestedScrollWebView.domainSettingsApplied && newHostName!!.contains(".")) {  // Stop checking if domain settings are already applied or there are no more `.` in the hostname.
+                if (domainsSettingsSet.contains("*.$newHostName")) {  // Check the host name prepended by `*.`.
+                    // Set the domain settings applied tracker to true.
+                    nestedScrollWebView.domainSettingsApplied = true
 
-                // Close the streams.
-                temporaryMhtFileOutputStream.close()
-                mhtFileInputStream.close()
+                    // Store the applied domain names as it appears in the database.
+                    domainNameInDatabase = "*.$newHostName"
+                }
 
-                // Load the temporary MHT file.
-                currentWebView!!.loadUrl(temporaryMhtFile.toString())
-            } catch (exception: Exception) {
-                // Display a snackbar.
-                Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                // Strip out the lowest subdomain of of the host name.
+                newHostName = newHostName.substring(newHostName.indexOf(".") + 1)
             }
-        } else {  // Let the WebView handle opening of the file.
-            // Open the file.
-            currentWebView!!.loadUrl(openFilePath)
-        }
-    }
 
-    private fun downloadUrlWithExternalApp(url: String) {
-        // Create a download intent.  Not specifying the action type will display the maximum number of options.
-        val downloadIntent = Intent()
+            // Apply either the domain settings or the default settings.
+            if (nestedScrollWebView.domainSettingsApplied) {  // The url has custom domain settings.
+                // Get a cursor for the current host.
+                val currentDomainSettingsCursor = domainsDatabaseHelper!!.getCursorForDomainName(domainNameInDatabase!!)
 
-        // Set the URI and the mime type.
-        downloadIntent.setDataAndType(Uri.parse(url), "text/html")
+                // Move to the first position.
+                currentDomainSettingsCursor.moveToFirst()
 
-        // Flag the intent to open in a new task.
-        downloadIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                // Get the settings from the cursor.
+                nestedScrollWebView.domainSettingsDatabaseId = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ID))
+                val javaScriptInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_JAVASCRIPT))
+                val cookiesInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(COOKIES))
+                val domStorageInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_DOM_STORAGE))
+                val easyListInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_EASYLIST))
+                val easyPrivacyInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_EASYPRIVACY))
+                val fanboysAnnoyanceListInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_FANBOYS_ANNOYANCE_LIST))
+                val fanboysSocialBlockingListInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_FANBOYS_SOCIAL_BLOCKING_LIST))
+                val ultraListInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(com.stoutner.privacybrowser.helpers.ULTRALIST))
+                val ultraPrivacyInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_ULTRAPRIVACY))
+                val blockAllThirdPartyRequestsInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(com.stoutner.privacybrowser.helpers.BLOCK_ALL_THIRD_PARTY_REQUESTS))
+                val userAgentName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(com.stoutner.privacybrowser.helpers.USER_AGENT))
+                val fontSize = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(FONT_SIZE))
+                val swipeToRefreshInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(SWIPE_TO_REFRESH))
+                val webViewThemeInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(WEBVIEW_THEME))
+                val wideViewportInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(WIDE_VIEWPORT))
+                val displayWebpageImagesInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DISPLAY_IMAGES))
+                val pinnedSslCertificate = (currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(PINNED_SSL_CERTIFICATE)) == 1)
+                val pinnedSslIssuedToCName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(SSL_ISSUED_TO_COMMON_NAME))
+                val pinnedSslIssuedToOName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(SSL_ISSUED_TO_ORGANIZATION))
+                val pinnedSslIssuedToUName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(SSL_ISSUED_TO_ORGANIZATIONAL_UNIT))
+                val pinnedSslIssuedByCName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(SSL_ISSUED_BY_COMMON_NAME))
+                val pinnedSslIssuedByOName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(SSL_ISSUED_BY_ORGANIZATION))
+                val pinnedSslIssuedByUName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(SSL_ISSUED_BY_ORGANIZATIONAL_UNIT))
+                val pinnedSslStartDate = Date(currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndexOrThrow(com.stoutner.privacybrowser.helpers.SSL_START_DATE)))
+                val pinnedSslEndDate = Date(currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndexOrThrow(com.stoutner.privacybrowser.helpers.SSL_END_DATE)))
+                val pinnedIpAddresses = (currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(PINNED_IP_ADDRESSES)) == 1)
+                val pinnedHostIpAddresses = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(IP_ADDRESSES))
 
-        // Show the chooser.
-        startActivity(Intent.createChooser(downloadIntent, getString(R.string.download_with_external_app)))
-    }
+                // Close the current host domain settings cursor.
+                currentDomainSettingsCursor.close()
 
-    override fun onSaveUrl(originalUrlString: String, fileNameString: String, dialogFragment: DialogFragment) {
-        // Store the URL.  This will be used in the save URL activity result launcher.
-        saveUrlString = if (originalUrlString.startsWith("data:")) {
-            // Save the original URL.
-            originalUrlString
-        } else {
-            // Get the dialog.
-            val dialog = dialogFragment.dialog!!
+                // Set the JavaScript status.
+                when (javaScriptInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.javaScriptEnabled = defaultJavaScript
+                    ENABLED -> nestedScrollWebView.settings.javaScriptEnabled = true
+                    DISABLED -> nestedScrollWebView.settings.javaScriptEnabled = false
+                }
 
-            // Get a handle for the dialog URL edit text.
-            val dialogUrlEditText = dialog.findViewById<EditText>(R.id.url_edittext)
+                // Store the cookies status.
+                when (cookiesInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.acceptCookies = defaultCookies
+                    ENABLED -> nestedScrollWebView.acceptCookies = true
+                    DISABLED -> nestedScrollWebView.acceptCookies = false
+                }
 
-            // Get the URL from the edit text, which may have been modified.
-            dialogUrlEditText.text.toString()
-        }
+                // Apply the cookies status.
+                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
 
-        // Open the file picker.
-        saveUrlActivityResultLauncher.launch(fileNameString)
-    }
+                // Set the DOM storage status.
+                when (domStorageInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.domStorageEnabled = defaultDomStorage
+                    ENABLED -> nestedScrollWebView.settings.domStorageEnabled = true
+                    DISABLED -> nestedScrollWebView.settings.domStorageEnabled = false
+                }
 
-    // Remove the warning that `OnTouchListener()` needs to override `performClick()`, as the only purpose of setting the `OnTouchListener()` is to make it do nothing.
-    @SuppressLint("ClickableViewAccessibility")
-    private fun initializeApp() {
-        // Get a handle for the input method.
-        val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
+                // Set the EasyList status.
+                when (easyListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.easyListEnabled = defaultEasyList
+                    ENABLED -> nestedScrollWebView.easyListEnabled = true
+                    DISABLED -> nestedScrollWebView.easyListEnabled = false
+                }
 
-        // Initialize the color spans for highlighting the URLs.
-        initialGrayColorSpan = ForegroundColorSpan(getColor(R.color.gray_500))
-        finalGrayColorSpan = ForegroundColorSpan(getColor(R.color.gray_500))
-        redColorSpan = ForegroundColorSpan(getColor(R.color.red_text))
+                // Set the EasyPrivacy status.
+                when (easyPrivacyInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.easyPrivacyEnabled = defaultEasyPrivacy
+                    ENABLED -> nestedScrollWebView.easyPrivacyEnabled = true
+                    DISABLED -> nestedScrollWebView.easyPrivacyEnabled = false
+                }
 
-        // Remove the formatting from the URL edit text when the user is editing the text.
-        urlEditText.onFocusChangeListener = View.OnFocusChangeListener { _: View?, hasFocus: Boolean ->
-            if (hasFocus) {  // The user is editing the URL text box.
-                // Remove the syntax highlighting.
-                urlEditText.text.removeSpan(redColorSpan)
-                urlEditText.text.removeSpan(initialGrayColorSpan)
-                urlEditText.text.removeSpan(finalGrayColorSpan)
-            } else {  // The user has stopped editing the URL text box.
-                // Move to the beginning of the string.
-                urlEditText.setSelection(0)
+                // Set the Fanboy's Annoyance List status.
+                when (fanboysAnnoyanceListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.fanboysAnnoyanceListEnabled = defaultFanboysAnnoyanceList
+                    ENABLED -> nestedScrollWebView.fanboysAnnoyanceListEnabled = true
+                    DISABLED -> nestedScrollWebView.fanboysAnnoyanceListEnabled = false
+                }
 
-                // Reapply the syntax highlighting.
-                UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
-            }
-        }
+                // Set the Fanboy's Social Blocking List status.
+                when (fanboysSocialBlockingListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.fanboysSocialBlockingListEnabled = defaultFanboysSocialBlockingList
+                    ENABLED -> nestedScrollWebView.fanboysSocialBlockingListEnabled = true
+                    DISABLED -> nestedScrollWebView.fanboysSocialBlockingListEnabled = false
+                }
 
-        // Set the go button on the keyboard to load the URL in url text box.
-        urlEditText.setOnKeyListener { _: View?, keyCode: Int, keyEvent: KeyEvent ->
-            // If the event is a key-down event on the `enter` button, load the URL.
-            if ((keyEvent.action == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The enter key was pressed.
-                // Load the URL.
-                loadUrlFromTextBox()
+                // Set the UltraList status.
+                when (ultraListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.ultraListEnabled = defaultUltraList
+                    ENABLED -> nestedScrollWebView.ultraListEnabled = true
+                    DISABLED -> nestedScrollWebView.ultraListEnabled = false
+                }
 
-                // Consume the event.
-                return@setOnKeyListener true
-            } else {  // Some other key was pressed.
-                // Do not consume the event.
-                return@setOnKeyListener false
-            }
-        }
+                // Set the UltraPrivacy status.
+                when (ultraPrivacyInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.ultraPrivacyEnabled = defaultUltraPrivacy
+                    ENABLED -> nestedScrollWebView.ultraPrivacyEnabled = true
+                    DISABLED -> nestedScrollWebView.ultraPrivacyEnabled = false
+                }
 
-        // Create an Orbot status broadcast receiver.
-        orbotStatusBroadcastReceiver = object : BroadcastReceiver() {
-            override fun onReceive(context: Context, intent: Intent) {
-                // Get the content of the status message.
-                orbotStatus = intent.getStringExtra("org.torproject.android.intent.extra.STATUS")!!
+                // Set the block all third-party requests status.
+                when (blockAllThirdPartyRequestsInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.blockAllThirdPartyRequests = defaultBlockAllThirdPartyRequests
+                    ENABLED -> nestedScrollWebView.blockAllThirdPartyRequests = true
+                    DISABLED -> nestedScrollWebView.blockAllThirdPartyRequests = false
+                }
 
-                // If Privacy Browser is waiting on the proxy, load the website now that Orbot is connected.
-                if ((orbotStatus == ProxyHelper.ORBOT_STATUS_ON) && waitingForProxy) {
-                    // Reset the waiting for proxy status.
-                    waitingForProxy = false
+                // Set the user agent.
+                if (userAgentName == getString(R.string.system_default_user_agent)) {  // Use the system default user agent.
+                    // Set the user agent according to the system default.
+                    when (val defaultUserAgentArrayPosition = userAgentNamesArrayAdapter.getPosition(defaultUserAgentName)) {
+                        UNRECOGNIZED_USER_AGENT ->  // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
+                            nestedScrollWebView.settings.userAgentString = defaultUserAgentName
 
-                    // Get a list of the current fragments.
-                    val fragmentList = supportFragmentManager.fragments
+                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT ->  // Set the user agent to `""`, which uses the default value.
+                            nestedScrollWebView.settings.userAgentString = ""
 
-                    // Check each fragment to see if it is a waiting for proxy dialog.  Sometimes more than one is displayed.
-                    for (i in fragmentList.indices) {
-                        // Get the fragment tag.
-                        val fragmentTag = fragmentList[i].tag
+                        SETTINGS_CUSTOM_USER_AGENT ->  // Set the default custom user agent.
+                            nestedScrollWebView.settings.userAgentString = sharedPreferences.getString(getString(R.string.custom_user_agent_key), getString(R.string.custom_user_agent_default_value))
 
-                        // Check to see if it is the waiting for proxy dialog.
-                        if (fragmentTag != null && fragmentTag == getString(R.string.waiting_for_proxy_dialog)) {
-                            // Dismiss the waiting for proxy dialog.
-                            (fragmentList[i] as DialogFragment).dismiss()
-                        }
+                        else ->  // Get the user agent string from the user agent data array
+                            nestedScrollWebView.settings.userAgentString = userAgentDataArray[defaultUserAgentArrayPosition]
                     }
+                } else {  // Set the user agent according to the stored name.
+                    // Set the user agent.
+                    when (val userAgentArrayPosition = userAgentNamesArrayAdapter.getPosition(userAgentName)) {
+                        // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
+                        UNRECOGNIZED_USER_AGENT ->
+                            nestedScrollWebView.settings.userAgentString = userAgentName
 
-                    // Reload existing URLs and load any URLs that are waiting for the proxy.
-                    for (i in 0 until webViewPagerAdapter!!.count) {
-                        // Get the WebView tab fragment.
-                        val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
-
-                        // Get the fragment view.
-                        val fragmentView = webViewTabFragment.view
-
-                        // Only process the WebViews if they exist.
-                        if (fragmentView != null) {
-                            // Get the nested scroll WebView from the tab fragment.
-                            val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
-
-                            // Get the waiting for proxy URL string.
-                            val waitingForProxyUrlString = nestedScrollWebView.waitingForProxyUrlString
+                        // Set the user agent to `""`, which uses the default value.
+                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT ->
+                            nestedScrollWebView.settings.userAgentString = ""
 
-                            // Load the pending URL if it exists.
-                            if (waitingForProxyUrlString.isNotEmpty()) {  // A URL is waiting to be loaded.
-                                // Load the URL.
-                                loadUrl(nestedScrollWebView, waitingForProxyUrlString)
+                        // Get the user agent string from the user agent data array.
+                        else ->
+                            nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
+                    }
+                }
 
-                                // Reset the waiting for proxy URL string.
-                                nestedScrollWebView.waitingForProxyUrlString = ""
-                            } else {  // No URL is waiting to be loaded.
-                                // Reload the existing URL.
-                                nestedScrollWebView.reload()
-                            }
-                        }
+                // Apply the font size.
+                try {  // Try the specified font size to see if it is valid.
+                    if (fontSize == 0) {  // Apply the default font size.
+                        // Set the font size from the value in the app settings.
+                        nestedScrollWebView.settings.textZoom = defaultFontSizeString.toInt()
+                    } else {  // Apply the font size from domain settings.
+                        nestedScrollWebView.settings.textZoom = fontSize
                     }
+                } catch (exception: Exception) {  // The specified font size is invalid
+                    // Set the font size to be 100%
+                    nestedScrollWebView.settings.textZoom = 100
                 }
-            }
-        }
 
-        // Register the Orbot status broadcast receiver.
-        registerReceiver(orbotStatusBroadcastReceiver, IntentFilter("org.torproject.android.intent.action.STATUS"))
+                // Set swipe to refresh.
+                when (swipeToRefreshInt) {
+                    SYSTEM_DEFAULT -> {
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.swipeToRefresh = defaultSwipeToRefresh
 
-        // Get handles for views that need to be modified.
-        val bookmarksHeaderLinearLayout = findViewById<LinearLayout>(R.id.bookmarks_header_linearlayout)
-        val launchBookmarksActivityFab = findViewById<FloatingActionButton>(R.id.launch_bookmarks_activity_fab)
-        val createBookmarkFolderFab = findViewById<FloatingActionButton>(R.id.create_bookmark_folder_fab)
-        val createBookmarkFab = findViewById<FloatingActionButton>(R.id.create_bookmark_fab)
-
-        // Update the WebView pager every time a tab is modified.
-        webViewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
-            override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}
+                        // Update the swipe refresh layout.
+                        if (defaultSwipeToRefresh) {  // Swipe to refresh is enabled.
+                            // Update the status of the swipe refresh layout if the current WebView is not null (crash reports indicate that in some unexpected way it sometimes is null).
+                            if (currentWebView != null) {
+                                // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
+                                swipeRefreshLayout.isEnabled = (currentWebView!!.scrollY == 0)
+                            }
+                        } else {  // Swipe to refresh is disabled.
+                            // Disable the swipe refresh layout.
+                            swipeRefreshLayout.isEnabled = false
+                        }
+                    }
 
-            override fun onPageSelected(position: Int) {
-                // Close the find on page bar if it is open.
-                closeFindOnPage(null)
+                    ENABLED -> {
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.swipeToRefresh = true
 
-                // Set the current WebView.
-                setCurrentWebView(position)
+                        // Update the status of the swipe refresh layout if the current WebView is not null (crash reports indicate that in some unexpected way it sometimes is null).
+                        if (currentWebView != null) {
+                            // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
+                            swipeRefreshLayout.isEnabled = (currentWebView!!.scrollY == 0)
+                        }
+                    }
 
-                // Select the corresponding tab if it does not match the currently selected page.  This will happen if the page was scrolled by creating a new tab.
-                if (tabLayout.selectedTabPosition != position) {
-                    // Wait until the new tab has been created.
-                    tabLayout.post {
-                        // Get a handle for the tab.
-                        val tab = tabLayout.getTabAt(position)!!
+                    DISABLED -> {
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.swipeToRefresh = false
 
-                        // Select the tab.
-                        tab.select()
+                        // Disable swipe to refresh.
+                        swipeRefreshLayout.isEnabled = false
                     }
                 }
-            }
 
-            override fun onPageScrollStateChanged(state: Int) {}
-        })
+                // Set the WebView theme if algorithmic darkening is supported.
+                if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
+                    // Set the WebView theme.
+                    when (webViewThemeInt) {
+                        SYSTEM_DEFAULT ->  // Set the WebView theme.
+                            when (defaultWebViewTheme) {
+                                webViewThemeEntryValuesStringArray[1] ->  // The light theme is selected.  Turn off algorithmic darkening.
+                                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
 
-        // Handle tab selections.
-        tabLayout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
-            override fun onTabSelected(tab: TabLayout.Tab) {
-                // Select the same page in the view pager.
-                webViewPager.currentItem = tab.position
-            }
+                                webViewThemeEntryValuesStringArray[2] ->  // The dark theme is selected.  Turn on algorithmic darkening.
+                                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
 
-            override fun onTabUnselected(tab: TabLayout.Tab) {}
+                                else -> {  // The system default theme is selected.
+                                    // Get the current system theme status.
+                                    val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
 
-            override fun onTabReselected(tab: TabLayout.Tab) {
-                // Instantiate the View SSL Certificate dialog.
-                val viewSslCertificateDialogFragment: DialogFragment = ViewSslCertificateDialog.displayDialog(currentWebView!!.webViewFragmentId, currentWebView!!.getFavoriteIcon())
+                                    // Set the algorithmic darkening according to the current system theme status.
+                                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
+                                }
+                            }
 
-                // Display the View SSL Certificate dialog.
-                viewSslCertificateDialogFragment.show(supportFragmentManager, getString(R.string.view_ssl_certificate))
-            }
-        })
+                        LIGHT_THEME ->  // Turn off algorithmic darkening.
+                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
 
-        // Set a touch listener on the bookmarks header linear layout so that touches don't pass through to the button underneath.
-        bookmarksHeaderLinearLayout.setOnTouchListener { _: View?, _: MotionEvent? -> true }
+                        DARK_THEME ->  // Turn on algorithmic darkening.
+                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+                    }
+                }
 
-        // Set the launch bookmarks activity floating action button to launch the bookmarks activity.
-        launchBookmarksActivityFab.setOnClickListener {
-            // Get a copy of the favorite icon bitmap.
-            val currentFavoriteIconBitmap = currentWebView!!.getFavoriteIcon()
+                // Set the wide viewport status.
+                when (wideViewportInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.useWideViewPort = defaultWideViewport
+                    ENABLED -> nestedScrollWebView.settings.useWideViewPort = true
+                    DISABLED -> nestedScrollWebView.settings.useWideViewPort = false
+                }
 
-            // Create a favorite icon byte array output stream.
-            val currentFavoriteIconByteArrayOutputStream = ByteArrayOutputStream()
+                // Set the display webpage images status.
+                when (displayWebpageImagesInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.loadsImagesAutomatically = defaultDisplayWebpageImages
+                    ENABLED -> nestedScrollWebView.settings.loadsImagesAutomatically = true
+                    DISABLED -> nestedScrollWebView.settings.loadsImagesAutomatically = false
+                }
 
-            // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
-            currentFavoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, currentFavoriteIconByteArrayOutputStream)
+                // If there is a pinned SSL certificate, store it in the WebView.
+                if (pinnedSslCertificate)
+                    nestedScrollWebView.setPinnedSslCertificate(pinnedSslIssuedToCName, pinnedSslIssuedToOName, pinnedSslIssuedToUName, pinnedSslIssuedByCName, pinnedSslIssuedByOName, pinnedSslIssuedByUName,
+                        pinnedSslStartDate, pinnedSslEndDate)
 
-            // Convert the favorite icon byte array stream to a byte array.
-            val currentFavoriteIconByteArray = currentFavoriteIconByteArrayOutputStream.toByteArray()
+                // If there is a pinned IP address, store it in the WebView.
+                if (pinnedIpAddresses)
+                    nestedScrollWebView.pinnedIpAddresses = pinnedHostIpAddresses
 
-            // Create an intent to launch the bookmarks activity.
-            val bookmarksIntent = Intent(applicationContext, BookmarksActivity::class.java)
+                // Set a background on the URL relative layout to indicate that custom domain settings are being used.
+                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.drawable.domain_settings_url_background)
+            } else {  // The new URL does not have custom domain settings.  Load the defaults.
+                // Store the values from the shared preferences.
+                nestedScrollWebView.settings.javaScriptEnabled = defaultJavaScript
+                nestedScrollWebView.acceptCookies = defaultCookies
+                nestedScrollWebView.settings.domStorageEnabled = defaultDomStorage
+                nestedScrollWebView.easyListEnabled = defaultEasyList
+                nestedScrollWebView.easyPrivacyEnabled = defaultEasyPrivacy
+                nestedScrollWebView.fanboysAnnoyanceListEnabled = defaultFanboysAnnoyanceList
+                nestedScrollWebView.fanboysSocialBlockingListEnabled = defaultFanboysSocialBlockingList
+                nestedScrollWebView.ultraListEnabled = defaultUltraList
+                nestedScrollWebView.ultraPrivacyEnabled = defaultUltraPrivacy
+                nestedScrollWebView.blockAllThirdPartyRequests = defaultBlockAllThirdPartyRequests
 
-            // Add the extra information to the intent.
-            bookmarksIntent.putExtra(CURRENT_FOLDER, currentBookmarksFolder)
-            bookmarksIntent.putExtra(CURRENT_TITLE, currentWebView!!.title)
-            bookmarksIntent.putExtra(CURRENT_URL, currentWebView!!.url)
-            bookmarksIntent.putExtra(CURRENT_FAVORITE_ICON_BYTE_ARRAY, currentFavoriteIconByteArray)
+                // Apply the default cookie setting.
+                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
 
-            // Make it so.
-            startActivity(bookmarksIntent)
-        }
+                // Apply the default font size setting.
+                try {
+                    // Try to set the font size from the value in the app settings.
+                    nestedScrollWebView.settings.textZoom = defaultFontSizeString.toInt()
+                } catch (exception: Exception) {
+                    // If the app settings value is invalid, set the font size to 100%.
+                    nestedScrollWebView.settings.textZoom = 100
+                }
 
-        // Set the create new bookmark folder floating action button to display an alert dialog.
-        createBookmarkFolderFab.setOnClickListener {
-            // Create a create bookmark folder dialog.
-            val createBookmarkFolderDialog: DialogFragment = CreateBookmarkFolderDialog.createBookmarkFolder(currentWebView!!.getFavoriteIcon())
+                // Store the swipe to refresh status in the nested scroll WebView.
+                nestedScrollWebView.swipeToRefresh = defaultSwipeToRefresh
 
-            // Show the create bookmark folder dialog.
-            createBookmarkFolderDialog.show(supportFragmentManager, getString(R.string.create_folder))
-        }
+                // Update the swipe refresh layout.
+                if (defaultSwipeToRefresh) {  // Swipe to refresh is enabled.
+                    // Update the status of the swipe refresh layout if the current WebView is not null (crash reports indicate that in some unexpected way it sometimes is null).
+                    if (currentWebView != null) {
+                        // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
+                        swipeRefreshLayout.isEnabled = currentWebView!!.scrollY == 0
+                    }
+                } else {  // Swipe to refresh is disabled.
+                    // Disable the swipe refresh layout.
+                    swipeRefreshLayout.isEnabled = false
+                }
 
-        // Set the create new bookmark floating action button to display an alert dialog.
-        createBookmarkFab.setOnClickListener {
-            // Instantiate the create bookmark dialog.
-            val createBookmarkDialog: DialogFragment = CreateBookmarkDialog.createBookmark(currentWebView!!.url!!, currentWebView!!.title!!, currentWebView!!.getFavoriteIcon())
+                // Reset the domain settings database ID.
+                nestedScrollWebView.domainSettingsDatabaseId = -1
 
-            // Display the create bookmark dialog.
-            createBookmarkDialog.show(supportFragmentManager, getString(R.string.create_bookmark))
-        }
+                // Set the user agent.
+                when (val userAgentArrayPosition = userAgentNamesArrayAdapter.getPosition(defaultUserAgentName)) {
+                    UNRECOGNIZED_USER_AGENT ->  // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
+                        nestedScrollWebView.settings.userAgentString = defaultUserAgentName
 
-        // Search for the string on the page whenever a character changes in the find on page edit text.
-        findOnPageEditText.addTextChangedListener(object : TextWatcher {
-            override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
+                    SETTINGS_WEBVIEW_DEFAULT_USER_AGENT ->  // Set the user agent to `""`, which uses the default value.
+                        nestedScrollWebView.settings.userAgentString = ""
 
-            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
+                    SETTINGS_CUSTOM_USER_AGENT ->  // Set the default custom user agent.
+                        nestedScrollWebView.settings.userAgentString = sharedPreferences.getString(getString(R.string.custom_user_agent_key), getString(R.string.custom_user_agent_default_value))
 
-            override fun afterTextChanged(s: Editable) {
-                // Search for the text in the WebView if it is not null.  Sometimes on resume after a period of non-use the WebView will be null.
-                currentWebView?.findAllAsync(findOnPageEditText.text.toString())
-            }
-        })
+                    else ->  // Get the user agent string from the user agent data array
+                        nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
+                }
 
-        // Set the `check mark` button for the find on page edit text keyboard to close the soft keyboard.
-        findOnPageEditText.setOnKeyListener { _: View?, keyCode: Int, keyEvent: KeyEvent ->
-            if ((keyEvent.action == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The `enter` key was pressed.
-                // Hide the soft keyboard.
-                inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
+                // Set the WebView theme if algorithmic darkening is supported.
+                if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
+                    // Set the WebView theme.
+                    when (defaultWebViewTheme) {
+                        webViewThemeEntryValuesStringArray[1] ->  // The light theme is selected.  Turn off algorithmic darkening.
+                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
 
-                // Consume the event.
-                return@setOnKeyListener true
-            } else {  // A different key was pressed.
-                // Do not consume the event.
-                return@setOnKeyListener false
-            }
-        }
+                        webViewThemeEntryValuesStringArray[2] ->  // The dark theme is selected.  Turn on algorithmic darkening.
+                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
 
-        // Implement swipe to refresh.
-        swipeRefreshLayout.setOnRefreshListener {
-            // Reload the website.
-            currentWebView!!.reload()
-        }
+                        else -> {  // The system default theme is selected.  Get the current system theme status.
+                            // Get the current theme status.
+                            val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
 
-        // Store the default progress view offsets.
-        defaultProgressViewStartOffset = swipeRefreshLayout.progressViewStartOffset
-        defaultProgressViewEndOffset = swipeRefreshLayout.progressViewEndOffset
+                            // Set the algorithmic darkening according to the current system theme status.
+                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
+                        }
+                    }
+                }
 
-        // Set the refresh color scheme according to the theme.
-        swipeRefreshLayout.setColorSchemeResources(R.color.blue_text)
+                // Set the viewport.
+                nestedScrollWebView.settings.useWideViewPort = defaultWideViewport
 
-        // Initialize a color background typed value.
-        val colorBackgroundTypedValue = TypedValue()
+                // Set the loading of webpage images.
+                nestedScrollWebView.settings.loadsImagesAutomatically = defaultDisplayWebpageImages
 
-        // Get the color background from the theme.
-        theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
+                // Set a transparent background on the URL relative layout.
+                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.color.transparent)
+            }
 
-        // Get the color background int from the typed value.
-        val colorBackgroundInt = colorBackgroundTypedValue.data
+            // Update the privacy icons.
+            updatePrivacyIcons(true)
+        }
 
-        // Set the swipe refresh background color.
-        swipeRefreshLayout.setProgressBackgroundColorSchemeColor(colorBackgroundInt)
+        // Reload the website if returning from the Domains activity.
+        if (reloadWebsite)
+            nestedScrollWebView.reload()
 
-        // Set the drawer titles, which identify the drawer layouts in accessibility mode.
-        drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer))
-        drawerLayout.setDrawerTitle(GravityCompat.END, getString(R.string.bookmarks))
+        // Disable the wide viewport if the source is being viewed.
+        if (url.startsWith("view-source:"))
+            nestedScrollWebView.settings.useWideViewPort = false
 
-        // Load the bookmarks folder.
-        loadBookmarksFolder()
+        // Load the URL if directed.  This makes sure that the domain settings are properly loaded before the URL.  By using `loadUrl()`, instead of `loadUrlFromBase()`, the Referer header will never be sent.
+        if (loadUrl)
+            nestedScrollWebView.loadUrl(url)
+    }
 
-        // Handle clicks on bookmarks.
-        bookmarksListView.onItemClickListener = AdapterView.OnItemClickListener { _: AdapterView<*>?, _: View?, _: Int, id: Long ->
-            // Convert the id from long to int to match the format of the bookmarks database.
-            val databaseId = id.toInt()
+    private fun applyProxy(reloadWebViews: Boolean) {
+        // Set the proxy according to the mode.
+        proxyHelper.setProxy(applicationContext, appBarLayout, proxyMode)
 
-            // Get the bookmark cursor for this ID.
-            val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
+        // Reset the waiting for proxy tracker.
+        waitingForProxy = false
 
-            // Move the bookmark cursor to the first row.
-            bookmarkCursor.moveToFirst()
+        // Set the proxy.
+        when (proxyMode) {
+            ProxyHelper.NONE -> {
+                // Initialize a color background typed value.
+                val colorBackgroundTypedValue = TypedValue()
 
-            // Act upon the bookmark according to the type.
-            if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
-                // Store the folder name.
-                currentBookmarksFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.BOOKMARK_NAME))
+                // Get the color background from the theme.
+                theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
 
-                // Load the new folder.
-                loadBookmarksFolder()
-            } else {  // The selected bookmark is not a folder.
-                // Load the bookmark URL.
-                loadUrl(currentWebView!!, bookmarkCursor.getString(bookmarkCursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.BOOKMARK_URL)))
+                // Get the color background int from the typed value.
+                val colorBackgroundInt = colorBackgroundTypedValue.data
 
-                // Close the bookmarks drawer if it is not pinned.
-                if (!bookmarksDrawerPinned)
-                    drawerLayout.closeDrawer(GravityCompat.END)
+                // Set the default app bar layout background.
+                appBarLayout.setBackgroundColor(colorBackgroundInt)
             }
 
-            // Close the cursor.
-            bookmarkCursor.close()
-        }
+            ProxyHelper.TOR -> {
+                // Set the app bar background to indicate proxying is enabled.
+                appBarLayout.setBackgroundResource(R.color.blue_background)
 
-        // Handle long-presses on bookmarks.
-        bookmarksListView.onItemLongClickListener = AdapterView.OnItemLongClickListener { _: AdapterView<*>?, _: View?, _: Int, id: Long ->
-            // Convert the database ID from `long` to `int`.
-            val databaseId = id.toInt()
+                // Check to see if Orbot is installed.
+                try {
+                    // Get the package manager.
+                    val packageManager = packageManager
 
-            // Run the commands associated with the type.
-            if (bookmarksDatabaseHelper!!.isFolder(databaseId)) {  // The bookmark is a folder.
-                // Get a cursor of all the bookmarks in the folder.
-                val bookmarksCursor = bookmarksDatabaseHelper!!.getFolderBookmarks(databaseId)
+                    // Check to see if Orbot is in the list.  This will throw an error and drop to the catch section if it isn't installed.
+                    packageManager.getPackageInfo("org.torproject.android", 0)
 
-                // Move to the first entry in the cursor.
-                bookmarksCursor.moveToFirst()
+                    // Check to see if the proxy is ready.
+                    if (orbotStatus != ProxyHelper.ORBOT_STATUS_ON) {  // Orbot is not ready.
+                        // Set the waiting for proxy status.
+                        waitingForProxy = true
 
-                // Open each bookmark
-                for (i in 0 until bookmarksCursor.count) {
-                    // Load the bookmark in a new tab, moving to the tab for the first bookmark if the drawer is not pinned.
-                    addNewTab(bookmarksCursor.getString(bookmarksCursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.BOOKMARK_URL)), !bookmarksDrawerPinned && (i == 0))
+                        // Show the waiting for proxy dialog if it isn't already displayed.
+                        if (supportFragmentManager.findFragmentByTag(getString(R.string.waiting_for_proxy_dialog)) == null) {
+                            // Get a handle for the waiting for proxy alert dialog.
+                            val waitingForProxyDialogFragment = WaitingForProxyDialog()
 
-                    // Move to the next bookmark.
-                    bookmarksCursor.moveToNext()
-                }
+                            // Try to show the dialog.  Sometimes the window is not yet active if returning from Settings.
+                            try {
+                                // Show the waiting for proxy alert dialog.
+                                waitingForProxyDialogFragment.show(supportFragmentManager, getString(R.string.waiting_for_proxy_dialog))
+                            } catch (waitingForTorException: Exception) {
+                                // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
+                                pendingDialogsArrayList.add(PendingDialogDataClass(waitingForProxyDialogFragment, getString(R.string.waiting_for_proxy_dialog)))
+                            }
+                        }
+                    }
+                } catch (exception: PackageManager.NameNotFoundException) {  // Orbot is not installed.
+                    // Show the Orbot not installed dialog if it is not already displayed.
+                    if (supportFragmentManager.findFragmentByTag(getString(R.string.proxy_not_installed_dialog)) == null) {
+                        // Get a handle for the Orbot not installed alert dialog.
+                        val orbotNotInstalledDialogFragment = ProxyNotInstalledDialog.displayDialog(proxyMode)
 
-                // Close the cursor.
-                bookmarksCursor.close()
-            } else {  // The bookmark is not a folder.
-                // Get the bookmark cursor for this ID.
-                val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
+                        // Try to show the dialog.  Sometimes the window is not yet active if returning from Settings.
+                        try {
+                            // Display the Orbot not installed alert dialog.
+                            orbotNotInstalledDialogFragment.show(supportFragmentManager, getString(R.string.proxy_not_installed_dialog))
+                        } catch (orbotNotInstalledException: Exception) {
+                            // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
+                            pendingDialogsArrayList.add(PendingDialogDataClass(orbotNotInstalledDialogFragment, getString(R.string.proxy_not_installed_dialog)))
+                        }
+                    }
+                }
+            }
 
-                // Move the bookmark cursor to the first row.
-                bookmarkCursor.moveToFirst()
+            ProxyHelper.I2P -> {
+                // Set the app bar background to indicate proxying is enabled.
+                appBarLayout.setBackgroundResource(R.color.blue_background)
 
-                // Load the bookmark in a new tab and move to the tab if the drawer is not pinned.
-                addNewTab(bookmarkCursor.getString(bookmarkCursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.BOOKMARK_URL)), !bookmarksDrawerPinned)
+                // Check to see if I2P is installed.
+                try {
+                    // Check to see if the F-Droid flavor is installed.  This will throw an error and drop to the catch section if it isn't installed.
+                    packageManager.getPackageInfo("net.i2p.android.router", 0)
+                } catch (fdroidException: PackageManager.NameNotFoundException) {  // The F-Droid flavor is not installed.
+                    try {
+                        // Check to see if the Google Play flavor is installed.  This will throw an error and drop to the catch section if it isn't installed.
+                        packageManager.getPackageInfo("net.i2p.android", 0)
+                    } catch (googlePlayException: PackageManager.NameNotFoundException) {  // The Google Play flavor is not installed.
+                        // Sow the I2P not installed dialog if it is not already displayed.
+                        if (supportFragmentManager.findFragmentByTag(getString(R.string.proxy_not_installed_dialog)) == null) {
+                            // Get a handle for the waiting for proxy alert dialog.
+                            val i2pNotInstalledDialogFragment = ProxyNotInstalledDialog.displayDialog(proxyMode)
 
-                // Close the cursor.
-                bookmarkCursor.close()
+                            // Try to show the dialog.  Sometimes the window is not yet active if returning from Settings.
+                            try {
+                                // Display the I2P not installed alert dialog.
+                                i2pNotInstalledDialogFragment.show(supportFragmentManager, getString(R.string.proxy_not_installed_dialog))
+                            } catch (i2pNotInstalledException: Exception) {
+                                // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
+                                pendingDialogsArrayList.add(PendingDialogDataClass(i2pNotInstalledDialogFragment, getString(R.string.proxy_not_installed_dialog)))
+                            }
+                        }
+                    }
+                }
             }
 
-            // Close the bookmarks drawer if it is not pinned.
-            if (!bookmarksDrawerPinned)
-                drawerLayout.closeDrawer(GravityCompat.END)
-
-            // Consume the event.
-            true
+            ProxyHelper.CUSTOM ->
+                // Set the app bar background to indicate proxying is enabled.
+                appBarLayout.setBackgroundResource(R.color.blue_background)
         }
 
-        // The drawer listener is used to update the navigation menu.
-        drawerLayout.addDrawerListener(object : DrawerLayout.DrawerListener {
-            override fun onDrawerSlide(drawerView: View, slideOffset: Float) {}
+        // Reload the WebViews if requested and not waiting for the proxy.
+        if (reloadWebViews && !waitingForProxy) {
+            // Reload the WebViews.
+            for (i in 0 until webViewStateAdapter!!.itemCount) {
+                // Get the WebView tab fragment.
+                val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
-            override fun onDrawerOpened(drawerView: View) {}
+                // Get the fragment view.
+                val fragmentView = webViewTabFragment.view
 
-            override fun onDrawerClosed(drawerView: View) {
-                // Reset the drawer icon when the drawer is closed.  Otherwise, it remains an arrow if the drawer is open when the app is restarted.
-                actionBarDrawerToggle!!.syncState()
+                // Only reload the WebViews if they exist.
+                if (fragmentView != null) {
+                    // Get the nested scroll WebView from the tab fragment.
+                    val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
+
+                    // Reload the WebView.
+                    nestedScrollWebView.reload()
+                }
             }
+        }
+    }
 
-            override fun onDrawerStateChanged(newState: Int) {
-                if (newState == DrawerLayout.STATE_SETTLING || newState == DrawerLayout.STATE_DRAGGING) {  // A drawer is opening or closing.
-                    // Update the navigation menu items if the WebView is not null.
-                    if (currentWebView != null) {
-                        navigationBackMenuItem.isEnabled = currentWebView!!.canGoBack()
-                        navigationForwardMenuItem.isEnabled = currentWebView!!.canGoForward()
-                        navigationHistoryMenuItem.isEnabled = currentWebView!!.canGoBack() || currentWebView!!.canGoForward()
-                        navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + currentWebView!!.getRequestsCount(BLOCKED_REQUESTS)
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun bookmarksBack(@Suppress("UNUSED_PARAMETER")view: View?) {
+        if (currentBookmarksFolderId == HOME_FOLDER_ID) {  // The home folder is displayed.
+            // close the bookmarks drawer.
+            drawerLayout.closeDrawer(GravityCompat.END)
+        } else {  // A subfolder is displayed.
+            // Set the former parent folder as the current folder.
+            currentBookmarksFolderId = bookmarksDatabaseHelper!!.getParentFolderId(currentBookmarksFolderId)
 
-                        // Hide the keyboard (if displayed).
-                        inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
-                    }
+            // Load the new folder.
+            loadBookmarksFolder()
+        }
+    }
 
-                    // Clear the focus from from the URL text box.  This removes any text selection markers and context menus, which otherwise draw above the open drawers.
-                    urlEditText.clearFocus()
+    private fun calculateSettingsInt(settingCurrentlyEnabled: Boolean, settingEnabledByDefault: Boolean): Int {
+        return if (settingCurrentlyEnabled == settingEnabledByDefault)  // The current system default is used.
+            SYSTEM_DEFAULT
+        else if (settingCurrentlyEnabled)  // The setting is enabled, which is different from the system default.
+            ENABLED
+        else  // The setting is disabled, which is different from the system default.
+            DISABLED
+    }
 
-                    // Clear the focus from from the WebView if it is not null, which can happen if a user opens a drawer while the browser is being resumed.
-                    // Clearing the focus from the WebView removes any text selection markers and context menus, which otherwise draw above the open drawers.
-                    currentWebView?.clearFocus()
-                }
-            }
-        })
+    private fun clearAndExit() {
+        // Close the bookmarks cursor if it exists.
+        bookmarksCursor?.close()
 
-        // Inflate a bare WebView to get the default user agent.  It is not used to render content on the screen.
-        @SuppressLint("InflateParams") val webViewLayout = layoutInflater.inflate(R.layout.bare_webview, null, false)
+        // Close the databases helpers if they exist.
+        bookmarksDatabaseHelper?.close()
+        domainsDatabaseHelper?.close()
 
-        // Get a handle for the WebView.
-        val bareWebView = webViewLayout.findViewById<WebView>(R.id.bare_webview)
+        // Get the status of the clear everything preference.
+        val clearEverything = sharedPreferences.getBoolean(getString(R.string.clear_everything_key), true)
 
-        // Store the default user agent.
-        webViewDefaultUserAgent = bareWebView.settings.userAgentString
+        // Get a handle for the runtime.
+        val runtime = Runtime.getRuntime()
 
-        // Destroy the bare WebView.
-        bareWebView.destroy()
+        // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`,
+        // which links to `/data/data/com.stoutner.privacybrowser.standard`.
+        val privateDataDirectoryString = applicationInfo.dataDir
 
-        // Update the domains settings set.
-        updateDomainsSettingsSet()
-    }
+        // Clear cookies.
+        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_cookies_key), true)) {
+            // Ass the cookie manager to delete all the cookies.
+            cookieManager.removeAllCookies(null)
 
-    private fun applyAppSettings() {
-        // Store the values from the shared preferences in variables.
-        incognitoModeEnabled = sharedPreferences.getBoolean(getString(R.string.incognito_mode_key), false)
-        sanitizeTrackingQueries = sharedPreferences.getBoolean(getString(R.string.tracking_queries_key), true)
-        sanitizeAmpRedirects = sharedPreferences.getBoolean(getString(R.string.amp_redirects_key), true)
-        proxyMode = sharedPreferences.getString(getString(R.string.proxy_key), getString(R.string.proxy_default_value))!!
-        fullScreenBrowsingModeEnabled = sharedPreferences.getBoolean(getString(R.string.full_screen_browsing_mode_key), false)
-        hideAppBar = sharedPreferences.getBoolean(getString(R.string.hide_app_bar_key), true)
-        downloadWithExternalApp = sharedPreferences.getBoolean(getString(R.string.download_with_external_app_key), false)
-        scrollAppBar = sharedPreferences.getBoolean(getString(R.string.scroll_app_bar_key), true)
+            // Ask the cookie manager to flush the cookie database.
+            cookieManager.flush()
 
-        // Apply the saved proxy mode if the app has been restarted.
-        if (savedProxyMode != null) {
-            // Apply the saved proxy mode.
-            proxyMode = savedProxyMode!!
+            // Manually delete the cookies database, as the cookie manager sometimes will not flush its changes to disk before system exit is run.
+            try {
+                // Two commands must be used because `Runtime.exec()` does not like `*`.
+                val deleteCookiesProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/Cookies")
+                val deleteCookiesJournalProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/Cookies-journal")
 
-            // Reset the saved proxy mode.
-            savedProxyMode = null
+                // Wait until the processes have finished.
+                deleteCookiesProcess.waitFor()
+                deleteCookiesJournalProcess.waitFor()
+            } catch (exception: Exception) {
+                // Do nothing if an error is thrown.
+            }
         }
 
-        // Get the search string.
-        val searchString = sharedPreferences.getString(getString(R.string.search_key), getString(R.string.search_default_value))!!
+        // Clear DOM storage.
+        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_dom_storage_key), true)) {
+            // Ask web storage to clear the DOM storage.
+            WebStorage.getInstance().deleteAllData()
 
-        // Set the search string, using the custom search URL if specified.
-        searchURL = if (searchString == getString(R.string.custom_url_item))
-            sharedPreferences.getString(getString(R.string.search_custom_url_key), getString(R.string.search_custom_url_default_value))!!
-        else
-            searchString
+            // Manually delete the DOM storage files and directories, as web storage sometimes will not flush its changes to disk before system exit is run.
+            try {
+                // A string array must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
+                val deleteLocalStorageProcess = runtime.exec(arrayOf("rm", "-rf", "$privateDataDirectoryString/app_webview/Local Storage/"))
 
-        // Apply the proxy.
-        applyProxy(false)
+                // Multiple commands must be used because `Runtime.exec()` does not like `*`.
+                val deleteIndexProcess = runtime.exec("rm -rf $privateDataDirectoryString/app_webview/IndexedDB")
+                val deleteQuotaManagerProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/QuotaManager")
+                val deleteQuotaManagerJournalProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/QuotaManager-journal")
+                val deleteDatabaseProcess = runtime.exec("rm -rf $privateDataDirectoryString/app_webview/databases")
 
-        // Adjust the layout and scrolling parameters according to the position of the app bar.
-        if (bottomAppBar) {  // The app bar is on the bottom.
-            // Adjust the UI.
-            if (scrollAppBar || (inFullScreenBrowsingMode && hideAppBar)) {  // The app bar scrolls or full screen browsing mode is engaged with the app bar hidden.
-                // Reset the WebView padding to fill the available space.
-                swipeRefreshLayout.setPadding(0, 0, 0, 0)
-            } else {  // The app bar doesn't scroll or full screen browsing mode is not engaged with the app bar hidden.
-                // Move the WebView above the app bar layout.
-                swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
+                // Wait until the processes have finished.
+                deleteLocalStorageProcess.waitFor()
+                deleteIndexProcess.waitFor()
+                deleteQuotaManagerProcess.waitFor()
+                deleteQuotaManagerJournalProcess.waitFor()
+                deleteDatabaseProcess.waitFor()
+            } catch (exception: Exception) {
+                // Do nothing if an error is thrown.
+            }
+        }
 
-                // Show the app bar if it is scrolled off the screen.
-                if (appBarLayout.translationY != 0f) {
-                    // Animate the bottom app bar onto the screen.
-                    objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", 0f)
+        // Clear the logcat.
+        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_logcat_key), true)) {
+            try {
+                // Clear the logcat.  `-c` clears the logcat.  `-b all` clears all the buffers (instead of just crash, main, and system).
+                val process = Runtime.getRuntime().exec("logcat -b all -c")
 
-                    // Make it so.
-                    objectAnimator.start()
-                }
+                // Wait for the process to finish.
+                process.waitFor()
+            } catch (exception: IOException) {
+                // Do nothing.
+            } catch (exception: InterruptedException) {
+                // Do nothing.
             }
-        } else {  // The app bar is on the top.
-            // Get the current layout parameters.  Using coordinator layout parameters allows the `setBehavior()` command and using app bar layout parameters allows the `setScrollFlags()` command.
-            val swipeRefreshLayoutParams = swipeRefreshLayout.layoutParams as CoordinatorLayout.LayoutParams
-            val toolbarLayoutParams = toolbar.layoutParams as AppBarLayout.LayoutParams
-            val findOnPageLayoutParams = findOnPageLinearLayout.layoutParams as AppBarLayout.LayoutParams
-            val tabsLayoutParams = tabsLinearLayout.layoutParams as AppBarLayout.LayoutParams
+        }
 
-            // Add the scrolling behavior to the layout parameters.
-            if (scrollAppBar) {
-                // Enable scrolling of the app bar.
-                swipeRefreshLayoutParams.behavior = AppBarLayout.ScrollingViewBehavior()
-                toolbarLayoutParams.scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL or AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS or AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP
-                findOnPageLayoutParams.scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL or AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS or AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP
-                tabsLayoutParams.scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL or AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS or AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP
-            } else {
-                // Disable scrolling of the app bar.
-                swipeRefreshLayoutParams.behavior = null
-                toolbarLayoutParams.scrollFlags = 0
-                findOnPageLayoutParams.scrollFlags = 0
-                tabsLayoutParams.scrollFlags = 0
-
-                // Expand the app bar if it is currently collapsed.
-                appBarLayout.setExpanded(true)
-            }
-
-            // Set the app bar scrolling for each WebView.
-            for (i in 0 until webViewPagerAdapter!!.count) {
+        // Clear the cache.
+        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_cache_key), true)) {
+            // Clear the cache from each WebView.
+            for (i in 0 until webViewStateAdapter!!.itemCount) {
                 // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+                val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
-                // Get the fragment view.
-                val fragmentView = webViewTabFragment.view
+                // Get the WebView fragment view.
+                val webViewFragmentView = webViewTabFragment.view
 
-                // Only modify the WebViews if they exist.
-                if (fragmentView != null) {
+                // Only clear the cache if the WebView exists.
+                if (webViewFragmentView != null) {
                     // Get the nested scroll WebView from the tab fragment.
-                    val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
+                    val nestedScrollWebView = webViewFragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
 
-                    // Set the app bar scrolling.
-                    nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
+                    // Clear the cache for this WebView.
+                    nestedScrollWebView.clearCache(true)
                 }
             }
-        }
 
-        // Update the full screen browsing mode settings.
-        if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {  // Privacy Browser is currently in full screen browsing mode.
-            // Update the visibility of the app bar, which might have changed in the settings.
-            if (hideAppBar) {
-                // Hide the tab linear layout.
-                tabsLinearLayout.visibility = View.GONE
+            // Manually delete the cache directories.
+            try {
+                // Delete the main cache directory.
+                val deleteCacheProcess = runtime.exec("rm -rf $privateDataDirectoryString/cache")
 
-                // Hide the app bar.
-                appBar.hide()
-            } else {
-                // Show the tab linear layout.
-                tabsLinearLayout.visibility = View.VISIBLE
+                // Delete the secondary `Service Worker` cache directory.
+                // A string array must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
+                val deleteServiceWorkerProcess = runtime.exec(arrayOf("rm", "-rf", "$privateDataDirectoryString/app_webview/Default/Service Worker/"))
 
-                // Show the app bar.
-                appBar.show()
+                // Wait until the processes have finished.
+                deleteCacheProcess.waitFor()
+                deleteServiceWorkerProcess.waitFor()
+            } catch (exception: Exception) {
+                // Do nothing if an error is thrown.
             }
+        }
 
-            /* Hide the system bars.
-             * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-             * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
-             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-             */
+        // Wipe out each WebView.
+        for (i in 0 until webViewStateAdapter!!.itemCount) {
+            // Get the WebView tab fragment.
+            val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
-            // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-            @Suppress("DEPRECATION")
-            rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
-        } else {  // Privacy Browser is not in full screen browsing mode.
-            // Reset the full screen tracker, which could be true if Privacy Browser was in full screen mode before entering settings and full screen browsing was disabled.
-            inFullScreenBrowsingMode = false
+            // Get the WebView frame layout.
+            val webViewFrameLayout = webViewTabFragment.view as FrameLayout?
 
-            // Show the tab linear layout.
-            tabsLinearLayout.visibility = View.VISIBLE
+            // Only wipe out the WebView if it exists.
+            if (webViewFrameLayout != null) {
+                // Get the nested scroll WebView from the tab fragment.
+                val nestedScrollWebView = webViewFrameLayout.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
 
-            // Show the app bar.
-            appBar.show()
+                // Clear SSL certificate preferences for this WebView.
+                nestedScrollWebView.clearSslPreferences()
 
-            // Remove the `SYSTEM_UI` flags from the root frame layout.  The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-            @Suppress("DEPRECATION")
-            rootFrameLayout.systemUiVisibility = 0
-        }
-    }
+                // Clear the back/forward history for this WebView.
+                nestedScrollWebView.clearHistory()
 
-    override fun navigateHistory(url: String, steps: Int) {
-        // Apply the domain settings.
-        applyDomainSettings(currentWebView!!, url, resetTab = false, reloadWebsite = false, loadUrl = false)
+                // Remove all the views from the frame layout.
+                webViewFrameLayout.removeAllViews()
 
-        // Load the history entry.
-        currentWebView!!.goBackOrForward(steps)
-    }
+                // Destroy the internal state of the WebView.
+                nestedScrollWebView.destroy()
+            }
+        }
 
-    override fun pinnedErrorGoBack() {
-        // Get the current web back forward list.
-        val webBackForwardList = currentWebView!!.copyBackForwardList()
+        // Manually delete the `app_webview` folder, which contains the cookies, DOM storage, form data, and `Service Worker` cache.
+        // See `https://code.google.com/p/android/issues/detail?id=233826&thanks=233826&ts=1486670530`.
+        if (clearEverything) {
+            try {
+                // Delete the folder.
+                val deleteAppWebviewProcess = runtime.exec("rm -rf $privateDataDirectoryString/app_webview")
 
-        // Get the previous entry URL.
-        val previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.currentIndex - 1).url
+                // Wait until the process has finished.
+                deleteAppWebviewProcess.waitFor()
+            } catch (exception: Exception) {
+                // Do nothing if an error is thrown.
+            }
+        }
 
-        // Apply the domain settings.
-        applyDomainSettings(currentWebView!!, previousUrl, resetTab = false, reloadWebsite = false, loadUrl = false)
+        // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
+        finishAndRemoveTask()
 
-        // Go back.
-        currentWebView!!.goBack()
+        // Remove the terminated program from RAM.  The status code is `0`.
+        exitProcess(0)
     }
 
-    // `reloadWebsite` is used if returning from the Domains activity.  Otherwise JavaScript might not function correctly if it is newly enabled.
-    @SuppressLint("SetJavaScriptEnabled")
-    private fun applyDomainSettings(nestedScrollWebView: NestedScrollWebView, url: String?, resetTab: Boolean, reloadWebsite: Boolean, loadUrl: Boolean) {
-        // Store the current URL.
-        nestedScrollWebView.currentUrl = url!!
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun closeFindOnPage(@Suppress("UNUSED_PARAMETER")view: View?) {
+        // Delete the contents of the find on page edit text.
+        findOnPageEditText.text = null
 
-        // Parse the URL into a URI.
-        val uri = Uri.parse(url)
+        // Clear the highlighted phrases if the WebView is not null.
+        currentWebView?.clearMatches()
 
-        // Extract the domain from the URI.
-        var newHostName = uri.host
+        // Hide the find on page linear layout.
+        findOnPageLinearLayout.visibility = View.GONE
 
-        // Strings don't like to be null.
-        if (newHostName == null)
-            newHostName = ""
+        // Show the toolbar.
+        toolbar.visibility = View.VISIBLE
 
-        // Apply the domain settings if a new domain is being loaded or if the new domain is blank.  This allows the user to set temporary settings for JavaScript, cookies, DOM storage, etc.
-        if (nestedScrollWebView.currentDomainName != newHostName || newHostName == "") {
-            // Set the new host name as the current domain name.
-            nestedScrollWebView.currentDomainName = newHostName
+        // Get a handle for the input method manager.
+        val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
 
-            // Reset the ignoring of pinned domain information.
-            nestedScrollWebView.ignorePinnedDomainInformation = false
+        // Hide the keyboard.
+        inputMethodManager.hideSoftInputFromWindow(toolbar.windowToken, 0)
+    }
 
-            // Clear any pinned SSL certificate or IP addresses.
-            nestedScrollWebView.clearPinnedSslCertificate()
-            nestedScrollWebView.pinnedIpAddresses = ""
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun closeTab(@Suppress("UNUSED_PARAMETER")view: View?) {
+        // Run the command according to the number of tabs.
+        if (tabLayout.tabCount > 1) {  // There is more than one tab open.
+            // Get the current tab number.
+            val currentTabNumber = tabLayout.selectedTabPosition
+
+            // Delete the current tab.
+            tabLayout.removeTabAt(currentTabNumber)
+
+            // Delete the current page.  If the selected page number did not change during the delete (because the newly selected tab has has same number as the previously deleted tab), it will return true,
+            // meaning that the current WebView must be reset.  Otherwise it will happen automatically as the selected tab number changes.
+            if (webViewStateAdapter!!.deletePage(currentTabNumber, webViewViewPager2))
+                setCurrentWebView(currentTabNumber)
+        } else {  // There is only one tab open.
+            clearAndExit()
+        }
+    }
 
-            // Reset the favorite icon if specified.
-            if (resetTab) {
-                // Initialize the favorite icon.
-                nestedScrollWebView.initializeFavoriteIcon()
+    override fun createBookmark(dialogFragment: DialogFragment, favoriteIconBitmap: Bitmap) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
 
-                // Get the current page position.
-                val currentPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+        // Get the views from the dialog fragment.
+        val createBookmarkNameEditText = dialog.findViewById<EditText>(R.id.create_bookmark_name_edittext)
+        val createBookmarkUrlEditText = dialog.findViewById<EditText>(R.id.create_bookmark_url_edittext)
 
-                // Get the corresponding tab.
-                val tab = tabLayout.getTabAt(currentPagePosition)
+        // Extract the strings from the edit texts.
+        val bookmarkNameString = createBookmarkNameEditText.text.toString()
+        val bookmarkUrlString = createBookmarkUrlEditText.text.toString()
 
-                // Update the tab if it isn't null, which sometimes happens when restarting from the background.
-                if (tab != null) {
-                    // Get the tab custom view.
-                    val tabCustomView = tab.customView!!
+        // Create a favorite icon byte array output stream.
+        val favoriteIconByteArrayOutputStream = ByteArrayOutputStream()
 
-                    // Get the tab views.
-                    val tabFavoriteIconImageView = tabCustomView.findViewById<ImageView>(R.id.favorite_icon_imageview)
-                    val tabTitleTextView = tabCustomView.findViewById<TextView>(R.id.title_textview)
+        // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+        favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream)
 
-                    // Set the default favorite icon as the favorite icon for this tab.
-                    tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(nestedScrollWebView.getFavoriteIcon(), 64, 64, true))
+        // Convert the favorite icon byte array stream to a byte array.
+        val favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray()
 
-                    // Set the loading title text.
-                    tabTitleTextView.setText(R.string.loading)
-                }
-            }
+        // Display the new bookmark below the current items in the (0 indexed) list.
+        val newBookmarkDisplayOrder = bookmarksListView.count
 
-            // Initialize the domain name in database variable.
-            var domainNameInDatabase: String? = null
+        // Create the bookmark.
+        bookmarksDatabaseHelper!!.createBookmark(bookmarkNameString, bookmarkUrlString, currentBookmarksFolderId, newBookmarkDisplayOrder, favoriteIconByteArray)
 
-            // Check the hostname against the domain settings set.
-            if (domainsSettingsSet.contains(newHostName)) {  // The hostname is contained in the domain settings set.
-                // Record the domain name in the database.
-                domainNameInDatabase = newHostName
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolderId)
 
-                // Set the domain settings applied tracker to true.
-                nestedScrollWebView.domainSettingsApplied = true
-            } else {  // The hostname is not contained in the domain settings set.
-                // Set the domain settings applied tracker to false.
-                nestedScrollWebView.domainSettingsApplied = false
-            }
+        // Update the list view.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
 
-            // Check all the subdomains of the host name against wildcard domains in the domain cursor.
-            while (!nestedScrollWebView.domainSettingsApplied && newHostName!!.contains(".")) {  // Stop checking if domain settings are already applied or there are no more `.` in the hostname.
-                if (domainsSettingsSet.contains("*.$newHostName")) {  // Check the host name prepended by `*.`.
-                    // Set the domain settings applied tracker to true.
-                    nestedScrollWebView.domainSettingsApplied = true
+        // Scroll to the new bookmark.
+        bookmarksListView.setSelection(newBookmarkDisplayOrder)
+    }
 
-                    // Store the applied domain names as it appears in the database.
-                    domainNameInDatabase = "*.$newHostName"
-                }
+    override fun createBookmarkFolder(dialogFragment: DialogFragment, favoriteIconBitmap: Bitmap) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
 
-                // Strip out the lowest subdomain of of the host name.
-                newHostName = newHostName.substring(newHostName.indexOf(".") + 1)
-            }
+        // Get handles for the views in the dialog fragment.
+        val folderNameEditText = dialog.findViewById<EditText>(R.id.folder_name_edittext)
+        val defaultIconRadioButton = dialog.findViewById<RadioButton>(R.id.default_icon_radiobutton)
+        val defaultIconImageView = dialog.findViewById<ImageView>(R.id.default_icon_imageview)
 
-            // Store the general preference information.
-            val defaultFontSizeString = sharedPreferences.getString(getString(R.string.font_size_key), getString(R.string.font_size_default_value))
-            val defaultUserAgentName = sharedPreferences.getString(getString(R.string.user_agent_key), getString(R.string.user_agent_default_value))
-            val defaultSwipeToRefresh = sharedPreferences.getBoolean(getString(R.string.swipe_to_refresh_key), true)
-            val webViewTheme = sharedPreferences.getString(getString(R.string.webview_theme_key), getString(R.string.webview_theme_default_value))
-            val wideViewport = sharedPreferences.getBoolean(getString(R.string.wide_viewport_key), true)
-            val displayWebpageImages = sharedPreferences.getBoolean(getString(R.string.display_webpage_images_key), true)
+        // Get new folder name string.
+        val folderNameString = folderNameEditText.text.toString()
 
-            // Get the WebView theme entry values string array.
-            val webViewThemeEntryValuesStringArray = resources.getStringArray(R.array.webview_theme_entry_values)
+        // Set the folder icon bitmap according to the dialog.
+        val folderIconBitmap: Bitmap = if (defaultIconRadioButton.isChecked) {  // Use the default folder icon.
+            // Get the default folder icon drawable.
+            val folderIconDrawable = defaultIconImageView.drawable
 
-            // Initialize the user agent array adapter and string array.
-            val userAgentNamesArray = ArrayAdapter.createFromResource(this, R.array.user_agent_names, R.layout.spinner_item)
-            val userAgentDataArray = resources.getStringArray(R.array.user_agent_data)
+            // Convert the folder icon drawable to a bitmap drawable.
+            val folderIconBitmapDrawable = folderIconDrawable as BitmapDrawable
 
-            // Apply either the domain settings for the default settings.
-            if (nestedScrollWebView.domainSettingsApplied) {  // The url has custom domain settings.
-                // Get a cursor for the current host.
-                val currentDomainSettingsCursor = domainsDatabaseHelper!!.getCursorForDomainName(domainNameInDatabase!!)
+            // Convert the folder icon bitmap drawable to a bitmap.
+            folderIconBitmapDrawable.bitmap
+        } else {  // Use the WebView favorite icon.
+            // Copy the favorite icon bitmap to the folder icon bitmap.
+            favoriteIconBitmap
+        }
 
-                // Move to the first position.
-                currentDomainSettingsCursor.moveToFirst()
+        // Create a folder icon byte array output stream.
+        val folderIconByteArrayOutputStream = ByteArrayOutputStream()
 
-                // Get the settings from the cursor.
-                nestedScrollWebView.domainSettingsDatabaseId = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ID))
-                nestedScrollWebView.settings.javaScriptEnabled = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_JAVASCRIPT)) == 1
-                nestedScrollWebView.acceptCookies = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.COOKIES)) == 1
-                nestedScrollWebView.settings.domStorageEnabled = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_DOM_STORAGE)) == 1
-                // Form data can be removed once the minimum API >= 26.
-                val saveFormData = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_FORM_DATA)) == 1
-                nestedScrollWebView.easyListEnabled = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_EASYLIST)) == 1
-                nestedScrollWebView.easyPrivacyEnabled = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_EASYPRIVACY)) == 1
-                nestedScrollWebView.fanboysAnnoyanceListEnabled = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_FANBOYS_ANNOYANCE_LIST)) == 1
-                nestedScrollWebView.fanboysSocialBlockingListEnabled =
-                    currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_FANBOYS_SOCIAL_BLOCKING_LIST)) == 1
-                nestedScrollWebView.ultraListEnabled = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ULTRALIST)) == 1
-                nestedScrollWebView.ultraPrivacyEnabled = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.ENABLE_ULTRAPRIVACY)) == 1
-                nestedScrollWebView.blockAllThirdPartyRequests = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.BLOCK_ALL_THIRD_PARTY_REQUESTS)) == 1
-                val userAgentName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.USER_AGENT))
-                val fontSize = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.FONT_SIZE))
-                val swipeToRefreshInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SWIPE_TO_REFRESH))
-                val webViewThemeInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.WEBVIEW_THEME))
-                val wideViewportInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.WIDE_VIEWPORT))
-                val displayWebpageImagesInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.DISPLAY_IMAGES))
-                val pinnedSslCertificate = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.PINNED_SSL_CERTIFICATE)) == 1
-                val pinnedSslIssuedToCName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_ISSUED_TO_COMMON_NAME))
-                val pinnedSslIssuedToOName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_ISSUED_TO_ORGANIZATION))
-                val pinnedSslIssuedToUName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_ISSUED_TO_ORGANIZATIONAL_UNIT))
-                val pinnedSslIssuedByCName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_ISSUED_BY_COMMON_NAME))
-                val pinnedSslIssuedByOName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_ISSUED_BY_ORGANIZATION))
-                val pinnedSslIssuedByUName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_ISSUED_BY_ORGANIZATIONAL_UNIT))
-                val pinnedSslStartDate = Date(currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_START_DATE)))
-                val pinnedSslEndDate = Date(currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.SSL_END_DATE)))
-                val pinnedIpAddresses = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.PINNED_IP_ADDRESSES)) == 1
-                val pinnedHostIpAddresses = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.IP_ADDRESSES))
+        // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+        folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream)
 
-                // Close the current host domain settings cursor.
-                currentDomainSettingsCursor.close()
-
-                // If there is a pinned SSL certificate, store it in the WebView.
-                if (pinnedSslCertificate)
-                    nestedScrollWebView.setPinnedSslCertificate(pinnedSslIssuedToCName, pinnedSslIssuedToOName, pinnedSslIssuedToUName, pinnedSslIssuedByCName, pinnedSslIssuedByOName, pinnedSslIssuedByUName,
-                        pinnedSslStartDate, pinnedSslEndDate)
-
-                // If there is a pinned IP address, store it in the WebView.
-                if (pinnedIpAddresses)
-                    nestedScrollWebView.pinnedIpAddresses = pinnedHostIpAddresses
+        // Convert the folder icon byte array stream to a byte array.
+        val folderIconByteArray = folderIconByteArrayOutputStream.toByteArray()
 
-                // Apply the cookie domain settings.
-                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
+        // Move all the bookmarks down one in the display order.
+        for (i in 0 until bookmarksListView.count) {
+            // Get the bookmark database id.
+            val databaseId = bookmarksListView.getItemIdAtPosition(i).toInt()
 
-                // Apply the form data setting if the API < 26.
-                @Suppress("DEPRECATION")
-                if (Build.VERSION.SDK_INT < 26)
-                    nestedScrollWebView.settings.saveFormData = saveFormData
+            // Move the bookmark down one slot.
+            bookmarksDatabaseHelper!!.updateDisplayOrder(databaseId, displayOrder = i + 1)
+        }
 
-                // Apply the font size.
-                try {  // Try the specified font size to see if it is valid.
-                    if (fontSize == 0) {  // Apply the default font size.
-                        // Set the font size from the value in the app settings.
-                        nestedScrollWebView.settings.textZoom = defaultFontSizeString!!.toInt()
-                    } else {  // Apply the font size from domain settings.
-                        nestedScrollWebView.settings.textZoom = fontSize
-                    }
-                } catch (exception: Exception) {  // The specified font size is invalid
-                    // Set the font size to be 100%
-                    nestedScrollWebView.settings.textZoom = 100
-                }
+        // Create the folder, which will be placed at the top of the list view.
+        bookmarksDatabaseHelper!!.createFolder(folderNameString, currentBookmarksFolderId, displayOrder = 0, folderIconByteArray)
 
-                // Set the user agent.
-                if (userAgentName == getString(R.string.system_default_user_agent)) {  // Use the system default user agent.
-                    // Set the user agent according to the system default.
-                    when (val defaultUserAgentArrayPosition = userAgentNamesArray.getPosition(defaultUserAgentName)) {
-                        // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
-                        UNRECOGNIZED_USER_AGENT -> nestedScrollWebView.settings.userAgentString = defaultUserAgentName
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolderId)
 
-                        // Set the user agent to `""`, which uses the default value.
-                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT -> nestedScrollWebView.settings.userAgentString = ""
+        // Update the list view.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
 
-                        // Set the default custom user agent.
-                        SETTINGS_CUSTOM_USER_AGENT -> nestedScrollWebView.settings.userAgentString =
-                            sharedPreferences.getString(getString(R.string.custom_user_agent_key), getString(R.string.custom_user_agent_default_value))
+        // Scroll to the new folder.
+        bookmarksListView.setSelection(0)
+    }
 
-                        // Get the user agent string from the user agent data array
-                        else -> nestedScrollWebView.settings.userAgentString = userAgentDataArray[defaultUserAgentArrayPosition]
-                    }
-                } else {  // Set the user agent according to the stored name.
-                    // Set the user agent.
-                    when (val userAgentArrayPosition = userAgentNamesArray.getPosition(userAgentName)) {
-                        // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
-                        UNRECOGNIZED_USER_AGENT ->
-                            nestedScrollWebView.settings.userAgentString = userAgentName
+    private fun exitFullScreenVideo() {
+        // Re-enable the screen timeout.
+        fullScreenVideoFrameLayout.keepScreenOn = false
 
-                        // Set the user agent to `""`, which uses the default value.
-                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT ->
-                            nestedScrollWebView.settings.userAgentString = ""
+        // Unset the full screen video flag.
+        displayingFullScreenVideo = false
 
-                        // Get the user agent string from the user agent data array.
-                        else ->
-                            nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
-                    }
-                }
+        // Remove all the views from the full screen video frame layout.
+        fullScreenVideoFrameLayout.removeAllViews()
 
-                // Set swipe to refresh.
-                when (swipeToRefreshInt) {
-                    DomainsDatabaseHelper.SYSTEM_DEFAULT -> {
-                        // Store the swipe to refresh status in the nested scroll WebView.
-                        nestedScrollWebView.swipeToRefresh = defaultSwipeToRefresh
+        // Hide the full screen video frame layout.
+        fullScreenVideoFrameLayout.visibility = View.GONE
 
-                        // Update the swipe refresh layout.
-                        if (defaultSwipeToRefresh) {  // Swipe to refresh is enabled.
-                            // Update the status of the swipe refresh layout if the current WebView is not null (crash reports indicate that in some unexpected way it sometimes is null).
-                            if (currentWebView != null) {
-                                // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
-                                swipeRefreshLayout.isEnabled = (currentWebView!!.scrollY == 0)
-                            }
-                        } else {  // Swipe to refresh is disabled.
-                            // Disable the swipe refresh layout.
-                            swipeRefreshLayout.isEnabled = false
-                        }
-                    }
+        // Enable the sliding drawers.
+        drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
 
-                    DomainsDatabaseHelper.ENABLED -> {
-                        // Store the swipe to refresh status in the nested scroll WebView.
-                        nestedScrollWebView.swipeToRefresh = true
+        // Show the coordinator layout.
+        coordinatorLayout.visibility = View.VISIBLE
 
-                        // Update the status of the swipe refresh layout if the current WebView is not null (crash reports indicate that in some unexpected way it sometimes is null).
-                        if (currentWebView != null) {
-                            // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
-                            swipeRefreshLayout.isEnabled = (currentWebView!!.scrollY == 0)
-                        }
-                    }
+        // Apply the appropriate full screen mode flags.
+        if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {  // Privacy Browser is currently in full screen browsing mode.
+            // Hide the app bar if specified.
+            if (hideAppBar) {
+                // Hide the tab linear layout.
+                tabsLinearLayout.visibility = View.GONE
 
-                    DomainsDatabaseHelper.DISABLED -> {
-                        // Store the swipe to refresh status in the nested scroll WebView.
-                        nestedScrollWebView.swipeToRefresh = false
+                // Hide the app bar.
+                appBar.hide()
+            }
 
-                        // Disable swipe to refresh.
-                        swipeRefreshLayout.isEnabled = false
-                    }
-                }
+            /* Hide the system bars.
+             * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+             * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+             */
 
-                // Set the WebView theme if device is running API >= 29 and algorithmic darkening is supported.
-                if ((Build.VERSION.SDK_INT >= 29) && WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
-                    // Set the WebView theme.
-                    when (webViewThemeInt) {
-                        // Set the WebView theme.
-                        DomainsDatabaseHelper.SYSTEM_DEFAULT ->
-                            when (webViewTheme) {
-                                // The light theme is selected.  Turn off algorithmic darkening.
-                                webViewThemeEntryValuesStringArray[1] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
+            // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+            @Suppress("DEPRECATION")
+            rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+        } else {  // Switch to normal viewing mode.
+            // Remove the `SYSTEM_UI` flags from the root frame layout.  The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+            @Suppress("DEPRECATION")
+            rootFrameLayout.systemUiVisibility = 0
+        }
+    }
 
-                                // The dark theme is selected.  Turn on algorithmic darkening.
-                                webViewThemeEntryValuesStringArray[2] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun findNextOnPage(@Suppress("UNUSED_PARAMETER")view: View?) {
+        // Go to the next highlighted phrase on the page. `true` goes forwards instead of backwards.
+        currentWebView!!.findNext(true)
+    }
 
-                                // The system default theme is selected.
-                                else -> {
-                                    // Get the current system theme status.
-                                    val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun findPreviousOnPage(@Suppress("UNUSED_PARAMETER")view: View?) {
+        // Go to the previous highlighted phrase on the page.  `false` goes backwards instead of forwards.
+        currentWebView!!.findNext(false)
+    }
 
-                                    // Set the algorithmic darkening according to the current system theme status.
-                                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
-                                }
-                            }
+    override fun finishedPopulatingFilterLists(combinedFilterLists: ArrayList<ArrayList<List<Array<String>>>>) {
+        // Store the filter lists.
+        easyList = combinedFilterLists[0]
+        easyPrivacy = combinedFilterLists[1]
+        fanboysAnnoyanceList = combinedFilterLists[2]
+        fanboysSocialList = combinedFilterLists[3]
+        ultraList = combinedFilterLists[4]
+        ultraPrivacy = combinedFilterLists[5]
 
-                        // Turn off algorithmic darkening.
-                        DomainsDatabaseHelper.LIGHT_THEME -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
+        // Check to see if the activity has been restarted with a saved state.
+        if ((savedStateArrayList == null) || (savedStateArrayList!!.size == 0)) {  // The activity has not been restarted or it was restarted on start to change the theme.
+            // Add the first tab.
+            addNewPage(urlString = "", adjacent = false, moveToTab = false)
+        } else {  // The activity has been restarted with a saved state.
+            // Restore each tab.
+            for (i in savedStateArrayList!!.indices) {
+                // Add a new tab.
+                tabLayout.addTab(tabLayout.newTab())
 
-                        // Turn on algorithmic darkening.
-                        DomainsDatabaseHelper.DARK_THEME -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
-                    }
-                }
+                // Get the new tab.
+                val newTab = tabLayout.getTabAt(i)!!
 
-                // Set the wide viewport status.
-                when (wideViewportInt) {
-                    DomainsDatabaseHelper.SYSTEM_DEFAULT -> nestedScrollWebView.settings.useWideViewPort = wideViewport
-                    DomainsDatabaseHelper.ENABLED -> nestedScrollWebView.settings.useWideViewPort = true
-                    DomainsDatabaseHelper.DISABLED -> nestedScrollWebView.settings.useWideViewPort = false
-                }
+                // Set a custom view on the new tab.
+                newTab.setCustomView(R.layout.tab_custom_view)
 
-                // Set the display webpage images status.
-                when (displayWebpageImagesInt) {
-                    DomainsDatabaseHelper.SYSTEM_DEFAULT -> nestedScrollWebView.settings.loadsImagesAutomatically = displayWebpageImages
-                    DomainsDatabaseHelper.ENABLED -> nestedScrollWebView.settings.loadsImagesAutomatically = true
-                    DomainsDatabaseHelper.DISABLED -> nestedScrollWebView.settings.loadsImagesAutomatically = false
-                }
+                // Add the new page.
+                webViewStateAdapter!!.restorePage(savedStateArrayList!![i], savedNestedScrollWebViewStateArrayList!![i])
+            }
 
-                // Set a background on the URL relative layout to indicate that custom domain settings are being used.
-                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.drawable.domain_settings_url_background)
-            } else {  // The new URL does not have custom domain settings.  Load the defaults.
-                // Store the values from the shared preferences.
-                nestedScrollWebView.settings.javaScriptEnabled = sharedPreferences.getBoolean(getString(R.string.javascript_key), false)
-                nestedScrollWebView.acceptCookies = sharedPreferences.getBoolean(getString(R.string.cookies_key), false)
-                nestedScrollWebView.settings.domStorageEnabled = sharedPreferences.getBoolean(getString(R.string.dom_storage_key), false)
-                val saveFormData = sharedPreferences.getBoolean(getString(R.string.save_form_data_key), false) // Form data can be removed once the minimum API >= 26.
-                nestedScrollWebView.easyListEnabled = sharedPreferences.getBoolean(getString(R.string.easylist_key), true)
-                nestedScrollWebView.easyPrivacyEnabled = sharedPreferences.getBoolean(getString(R.string.easyprivacy_key), true)
-                nestedScrollWebView.fanboysAnnoyanceListEnabled = sharedPreferences.getBoolean(getString(R.string.fanboys_annoyance_list_key), true)
-                nestedScrollWebView.fanboysSocialBlockingListEnabled = sharedPreferences.getBoolean(getString(R.string.fanboys_social_blocking_list_key), true)
-                nestedScrollWebView.ultraListEnabled = sharedPreferences.getBoolean(getString(R.string.ultralist_key), true)
-                nestedScrollWebView.ultraPrivacyEnabled = sharedPreferences.getBoolean(getString(R.string.ultraprivacy_key), true)
-                nestedScrollWebView.blockAllThirdPartyRequests = sharedPreferences.getBoolean(getString(R.string.block_all_third_party_requests_key), false)
+            // Reset the saved state variables.
+            savedStateArrayList = null
+            savedNestedScrollWebViewStateArrayList = null
 
-                // Apply the default cookie setting.
-                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
+            // Get the intent that started the app.
+            val intent = intent
 
-                // Apply the default font size setting.
-                try {
-                    // Try to set the font size from the value in the app settings.
-                    nestedScrollWebView.settings.textZoom = defaultFontSizeString!!.toInt()
-                } catch (exception: Exception) {
-                    // If the app settings value is invalid, set the font size to 100%.
-                    nestedScrollWebView.settings.textZoom = 100
-                }
+            // Reset the intent.  This prevents a duplicate tab from being created on restart.
+            setIntent(Intent())
 
-                // Apply the form data setting if the API < 26.
-                if (Build.VERSION.SDK_INT < 26)
-                    @Suppress("DEPRECATION")
-                    nestedScrollWebView.settings.saveFormData = saveFormData
+            // Get the information from the intent.
+            val intentAction = intent.action
+            val intentUriData = intent.data
+            val intentStringExtra = intent.getStringExtra(Intent.EXTRA_TEXT)
 
-                // Store the swipe to refresh status in the nested scroll WebView.
-                nestedScrollWebView.swipeToRefresh = defaultSwipeToRefresh
+            // Determine if this is a web search.
+            val isWebSearch = (intentAction != null) && (intentAction == Intent.ACTION_WEB_SEARCH)
 
-                // Update the swipe refresh layout.
-                if (defaultSwipeToRefresh) {  // Swipe to refresh is enabled.
-                    // Update the status of the swipe refresh layout if the current WebView is not null (crash reports indicate that in some unexpected way it sometimes is null).
-                    if (currentWebView != null) {
-                        // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
-                        swipeRefreshLayout.isEnabled = currentWebView!!.scrollY == 0
+            // Only process the URI if it contains data or it is a web search.  If the user pressed the desktop icon after the app was already running the URI will be null.
+            if ((intentUriData != null) || (intentStringExtra != null) || isWebSearch) {  // A new tab is being loaded.
+                // Get the URL string.
+                val urlString = if (isWebSearch) {  // The intent is a web search.
+                    // Sanitize the search input.
+                    val encodedSearchString: String = try {
+                        URLEncoder.encode(intent.getStringExtra(SearchManager.QUERY), "UTF-8")
+                    } catch (exception: UnsupportedEncodingException) {
+                        ""
                     }
-                } else {  // Swipe to refresh is disabled.
-                    // Disable the swipe refresh layout.
-                    swipeRefreshLayout.isEnabled = false
-                }
-
-                // Reset the domain settings database ID.
-                nestedScrollWebView.domainSettingsDatabaseId = -1
-
-                // Set the user agent.
-                when (val userAgentArrayPosition = userAgentNamesArray.getPosition(defaultUserAgentName)) {
-                    // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
-                    UNRECOGNIZED_USER_AGENT -> nestedScrollWebView.settings.userAgentString = defaultUserAgentName
-
-                    // Set the user agent to `""`, which uses the default value.
-                    SETTINGS_WEBVIEW_DEFAULT_USER_AGENT -> nestedScrollWebView.settings.userAgentString = ""
-
-                    // Set the default custom user agent.
-                    SETTINGS_CUSTOM_USER_AGENT -> nestedScrollWebView.settings.userAgentString =
-                        sharedPreferences.getString(getString(R.string.custom_user_agent_key), getString(R.string.custom_user_agent_default_value))
 
-                    // Get the user agent string from the user agent data array
-                    else -> nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
+                    // Add the base search URL.
+                    searchURL + encodedSearchString
+                } else { // The intent contains a URL formatted as a URI or a URL in the string extra.
+                    // Get the URL string.
+                    intentUriData?.toString() ?: intentStringExtra!!
                 }
 
-                // Set the WebView theme if the device is running API >= 29 and algorithmic darkening is supported.
-                if ((Build.VERSION.SDK_INT >= 29) && WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
-                    // Set the WebView theme.
-                    when (webViewTheme) {
-                        // The light theme is selected.  Turn off algorithmic darkening.
-                        webViewThemeEntryValuesStringArray[1] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
-
-                        // The dark theme is selected.  Turn on algorithmic darkening.
-                        webViewThemeEntryValuesStringArray[2] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+                // Add a new tab if specified in the preferences.
+                if (sharedPreferences.getBoolean(getString(R.string.open_intents_in_new_tab_key), true)) {  // Load the URL in a new tab.
+                    // Set the loading new intent flag.
+                    loadingNewIntent = true
 
-                        // The system default theme is selected.  Get the current system theme status.
-                        else -> {
-                            // Get the current theme status.
-                            val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
+                    // Add a new tab.
+                    addNewPage(urlString, adjacent = false, moveToTab = true)
+                } else {  // Load the URL in the current tab.
+                    // Make it so.
+                    loadUrl(currentWebView!!, urlString)
+                }
+            } else {  // A new tab is not being loaded.
+                // Restore the selected tab position.
+                if (savedTabPosition == 0) {  // The first tab is selected.
+                    // Set the first page as the current WebView.
+                    setCurrentWebView(0)
+                } else {  // The first tab is not selected.
+                    // Select the tab when the layout has finished populating.
+                    tabLayout.post {
+                        // Get a handle for the tab.
+                        val tab = tabLayout.getTabAt(savedTabPosition)!!
 
-                            // Set the algorithmic darkening according to the current system theme status.
-                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
-                        }
+                        // Select the tab.
+                        tab.select()
                     }
                 }
-
-                // Set the viewport.
-                nestedScrollWebView.settings.useWideViewPort = wideViewport
-
-                // Set the loading of webpage images.
-                nestedScrollWebView.settings.loadsImagesAutomatically = displayWebpageImages
-
-                // Set a transparent background on the URL relative layout.
-                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.color.transparent)
             }
-
-            // Update the privacy icons.
-            updatePrivacyIcons(true)
         }
+    }
 
-        // Reload the website if returning from the Domains activity.
-        if (reloadWebsite)
-            nestedScrollWebView.reload()
-
-        // Load the URL if directed.  This makes sure that the domain settings are properly loaded before the URL.  By using `loadUrl()`, instead of `loadUrlFromBase()`, the Referer header will never be sent.
-        if (loadUrl)
-            nestedScrollWebView.loadUrl(url)
-    }
-
-    private fun applyProxy(reloadWebViews: Boolean) {
-        // Set the proxy according to the mode.
-        proxyHelper.setProxy(applicationContext, appBarLayout, proxyMode)
+    // Remove the warning that `OnTouchListener()` needs to override `performClick()`, as the only purpose of setting the `OnTouchListener()` is to make it do nothing.
+    @SuppressLint("ClickableViewAccessibility")
+    private fun initializeApp() {
+        // Get a handle for the input method.
+        val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
 
-        // Reset the waiting for proxy tracker.
-        waitingForProxy = false
+        // Initialize the color spans for highlighting the URLs.
+        initialGrayColorSpan = ForegroundColorSpan(getColor(R.color.gray_500))
+        finalGrayColorSpan = ForegroundColorSpan(getColor(R.color.gray_500))
+        redColorSpan = ForegroundColorSpan(getColor(R.color.red_text))
 
-        // Set the proxy.
-        when (proxyMode) {
-            ProxyHelper.NONE -> {
-                // Initialize a color background typed value.
-                val colorBackgroundTypedValue = TypedValue()
+        // Remove the formatting from the URL edit text when the user is editing the text.
+        urlEditText.onFocusChangeListener = View.OnFocusChangeListener { _: View?, hasFocus: Boolean ->
+            if (hasFocus) {  // The user is editing the URL text box.
+                // Remove the syntax highlighting.
+                urlEditText.text.removeSpan(redColorSpan)
+                urlEditText.text.removeSpan(initialGrayColorSpan)
+                urlEditText.text.removeSpan(finalGrayColorSpan)
+            } else {  // The user has stopped editing the URL text box.
+                // Move to the beginning of the string.
+                urlEditText.setSelection(0)
 
-                // Get the color background from the theme.
-                theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
+                // Reapply the syntax highlighting.
+                UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
+            }
+        }
 
-                // Get the color background int from the typed value.
-                val colorBackgroundInt = colorBackgroundTypedValue.data
+        // Set the go button on the keyboard to load the URL in url text box.
+        urlEditText.setOnKeyListener { _: View?, keyCode: Int, keyEvent: KeyEvent ->
+            // If the event is a key-down event on the `enter` button, load the URL.
+            if ((keyEvent.action == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The enter key was pressed.
+                // Load the URL.
+                loadUrlFromTextBox()
 
-                // Set the default app bar layout background.
-                appBarLayout.setBackgroundColor(colorBackgroundInt)
+                // Consume the event.
+                return@setOnKeyListener true
+            } else {  // Some other key was pressed.
+                // Do not consume the event.
+                return@setOnKeyListener false
             }
+        }
 
-            ProxyHelper.TOR -> {
-                // Set the app bar background to indicate proxying is enabled.
-                appBarLayout.setBackgroundResource(R.color.proxy_appbar_background)
-
-                // Check to see if Orbot is installed.
-                try {
-                    // Get the package manager.
-                    val packageManager = packageManager
+        // Create an Orbot status broadcast receiver.
+        orbotStatusBroadcastReceiver = object : BroadcastReceiver() {
+            override fun onReceive(context: Context, intent: Intent) {
+                // Get the content of the status message.
+                orbotStatus = intent.getStringExtra("org.torproject.android.intent.extra.STATUS")!!
 
-                    // Check to see if Orbot is in the list.  This will throw an error and drop to the catch section if it isn't installed.  The deprecated method must be used until the minimum API >= 33.
-                    @Suppress("DEPRECATION")
-                    packageManager.getPackageInfo("org.torproject.android", 0)
+                // If Privacy Browser is waiting on the proxy, load the website now that Orbot is connected.
+                if ((orbotStatus == ProxyHelper.ORBOT_STATUS_ON) && waitingForProxy) {
+                    // Reset the waiting for proxy status.
+                    waitingForProxy = false
 
-                    // Check to see if the proxy is ready.
-                    if (orbotStatus != ProxyHelper.ORBOT_STATUS_ON) {  // Orbot is not ready.
-                        // Set the waiting for proxy status.
-                        waitingForProxy = true
+                    // Get a list of the current fragments.
+                    val fragmentList = supportFragmentManager.fragments
 
-                        // Show the waiting for proxy dialog if it isn't already displayed.
-                        if (supportFragmentManager.findFragmentByTag(getString(R.string.waiting_for_proxy_dialog)) == null) {
-                            // Get a handle for the waiting for proxy alert dialog.
-                            val waitingForProxyDialogFragment = WaitingForProxyDialog()
+                    // Check each fragment to see if it is a waiting for proxy dialog.  Sometimes more than one is displayed.
+                    for (i in fragmentList.indices) {
+                        // Get the fragment tag.
+                        val fragmentTag = fragmentList[i].tag
 
-                            // Try to show the dialog.  Sometimes the window is not yet active if returning from Settings.
-                            try {
-                                // Show the waiting for proxy alert dialog.
-                                waitingForProxyDialogFragment.show(supportFragmentManager, getString(R.string.waiting_for_proxy_dialog))
-                            } catch (waitingForTorException: Exception) {
-                                // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
-                                pendingDialogsArrayList.add(PendingDialogDataClass(waitingForProxyDialogFragment, getString(R.string.waiting_for_proxy_dialog)))
-                            }
+                        // Check to see if it is the waiting for proxy dialog.
+                        if (fragmentTag != null && fragmentTag == getString(R.string.waiting_for_proxy_dialog)) {
+                            // Dismiss the waiting for proxy dialog.
+                            (fragmentList[i] as DialogFragment).dismiss()
                         }
                     }
-                } catch (exception: PackageManager.NameNotFoundException) {  // Orbot is not installed.
-                    // Show the Orbot not installed dialog if it is not already displayed.
-                    if (supportFragmentManager.findFragmentByTag(getString(R.string.proxy_not_installed_dialog)) == null) {
-                        // Get a handle for the Orbot not installed alert dialog.
-                        val orbotNotInstalledDialogFragment = ProxyNotInstalledDialog.displayDialog(proxyMode)
 
-                        // Try to show the dialog.  Sometimes the window is not yet active if returning from Settings.
-                        try {
-                            // Display the Orbot not installed alert dialog.
-                            orbotNotInstalledDialogFragment.show(supportFragmentManager, getString(R.string.proxy_not_installed_dialog))
-                        } catch (orbotNotInstalledException: Exception) {
-                            // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
-                            pendingDialogsArrayList.add(PendingDialogDataClass(orbotNotInstalledDialogFragment, getString(R.string.proxy_not_installed_dialog)))
-                        }
-                    }
-                }
-            }
+                    // Reload existing URLs and load any URLs that are waiting for the proxy.
+                    for (i in 0 until webViewStateAdapter!!.itemCount) {
+                        // Get the WebView tab fragment.
+                        val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
-            ProxyHelper.I2P -> {
-                // Set the app bar background to indicate proxying is enabled.
-                appBarLayout.setBackgroundResource(R.color.proxy_appbar_background)
+                        // Get the fragment view.
+                        val fragmentView = webViewTabFragment.view
 
-                // Check to see if I2P is installed.
-                try {
-                    // Check to see if the F-Droid flavor is installed.  This will throw an error and drop to the catch section if it isn't installed.
-                    // The deprecated method must be used until the minimum API >= 33.
-                    @Suppress("DEPRECATION")
-                    packageManager.getPackageInfo("net.i2p.android.router", 0)
-                } catch (fdroidException: PackageManager.NameNotFoundException) {  // The F-Droid flavor is not installed.
-                    try {
-                        // Check to see if the Google Play flavor is installed.  This will throw an error and drop to the catch section if it isn't installed.
-                        // The deprecated method must be used until the minimum API >= 33.
-                        @Suppress("DEPRECATION")
-                        packageManager.getPackageInfo("net.i2p.android", 0)
-                    } catch (googlePlayException: PackageManager.NameNotFoundException) {  // The Google Play flavor is not installed.
-                        // Sow the I2P not installed dialog if it is not already displayed.
-                        if (supportFragmentManager.findFragmentByTag(getString(R.string.proxy_not_installed_dialog)) == null) {
-                            // Get a handle for the waiting for proxy alert dialog.
-                            val i2pNotInstalledDialogFragment = ProxyNotInstalledDialog.displayDialog(proxyMode)
+                        // Only process the WebViews if they exist.
+                        if (fragmentView != null) {
+                            // Get the nested scroll WebView from the tab fragment.
+                            val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
 
-                            // Try to show the dialog.  Sometimes the window is not yet active if returning from Settings.
-                            try {
-                                // Display the I2P not installed alert dialog.
-                                i2pNotInstalledDialogFragment.show(supportFragmentManager, getString(R.string.proxy_not_installed_dialog))
-                            } catch (i2pNotInstalledException: Exception) {
-                                // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
-                                pendingDialogsArrayList.add(PendingDialogDataClass(i2pNotInstalledDialogFragment, getString(R.string.proxy_not_installed_dialog)))
+                            // Get the waiting for proxy URL string.
+                            val waitingForProxyUrlString = nestedScrollWebView.waitingForProxyUrlString
+
+                            // Load the pending URL if it exists.
+                            if (waitingForProxyUrlString.isNotEmpty()) {  // A URL is waiting to be loaded.
+                                // Load the URL.
+                                loadUrl(nestedScrollWebView, waitingForProxyUrlString)
+
+                                // Reset the waiting for proxy URL string.
+                                nestedScrollWebView.waitingForProxyUrlString = ""
+                            } else {  // No URL is waiting to be loaded.
+                                // Reload the existing URL.
+                                nestedScrollWebView.reload()
                             }
                         }
                     }
                 }
             }
-
-            ProxyHelper.CUSTOM ->
-                // Set the app bar background to indicate proxying is enabled.
-                appBarLayout.setBackgroundResource(R.color.proxy_appbar_background)
         }
 
-        // Reload the WebViews if requested and not waiting for the proxy.
-        if (reloadWebViews && !waitingForProxy) {
-            // Reload the WebViews.
-            for (i in 0 until webViewPagerAdapter!!.count) {
-                // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+        // Register the Orbot status broadcast receiver.  `ContextCompat` must be used until the minimum API >= 34.
+        ContextCompat.registerReceiver(this, orbotStatusBroadcastReceiver, IntentFilter("org.torproject.android.intent.action.STATUS"), ContextCompat.RECEIVER_EXPORTED)
 
-                // Get the fragment view.
-                val fragmentView = webViewTabFragment.view
+        // Get handles for views that need to be modified.
+        val bookmarksHeaderLinearLayout = findViewById<LinearLayout>(R.id.bookmarks_header_linearlayout)
+        val launchBookmarksActivityFab = findViewById<FloatingActionButton>(R.id.launch_bookmarks_activity_fab)
+        val createBookmarkFolderFab = findViewById<FloatingActionButton>(R.id.create_bookmark_folder_fab)
+        val createBookmarkFab = findViewById<FloatingActionButton>(R.id.create_bookmark_fab)
 
-                // Only reload the WebViews if they exist.
-                if (fragmentView != null) {
-                    // Get the nested scroll WebView from the tab fragment.
-                    val nestedScrollWebView = fragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
+        // Handle tab selections.
+        tabLayout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
+            override fun onTabSelected(tab: TabLayout.Tab) {
+                // Close the find on page bar if it is open.
+                closeFindOnPage(null)
 
-                    // Reload the WebView.
-                    nestedScrollWebView.reload()
+                // Update the view pager when it has quiesced.  Otherwise, if a page launched by a new intent on restart has not yet been created, the view pager will not be updated to match the tab layout.
+                webViewViewPager2.post {
+                    // Select the same page in the view pager.
+                    webViewViewPager2.currentItem = tab.position
+
+                    // Set the current WebView after the tab layout has quiesced (otherwise, sometimes the wong WebView might be used).  See <https://redmine.stoutner.com/issues/1136>
+                    tabLayout.post {
+                        setCurrentWebView(tab.position)
+                    }
                 }
             }
-        }
-    }
-
-    private fun updatePrivacyIcons(runInvalidateOptionsMenu: Boolean) {
-        // Only update the privacy icons if the options menu and the current WebView have already been populated.
-        if ((optionsMenu != null) && (currentWebView != null)) {
-            // Update the privacy icon.
-            if (currentWebView!!.settings.javaScriptEnabled)  // JavaScript is enabled.
-                optionsPrivacyMenuItem.setIcon(R.drawable.javascript_enabled)
-            else if (currentWebView!!.acceptCookies)  // JavaScript is disabled but cookies are enabled.
-                optionsPrivacyMenuItem.setIcon(R.drawable.warning)
-            else  // All the dangerous features are disabled.
-                optionsPrivacyMenuItem.setIcon(R.drawable.privacy_mode)
 
-            // Update the cookies icon.
-            if (currentWebView!!.acceptCookies)
-                optionsCookiesMenuItem.setIcon(R.drawable.cookies_enabled)
-            else
-                optionsCookiesMenuItem.setIcon(R.drawable.cookies_disabled)
+            override fun onTabUnselected(tab: TabLayout.Tab) {}
 
-            // Update the refresh icon.
-            if (optionsRefreshMenuItem.title == getString(R.string.refresh))  // The refresh icon is displayed.
-                optionsRefreshMenuItem.setIcon(R.drawable.refresh_enabled)
-            else  // The stop icon is displayed.
-                optionsRefreshMenuItem.setIcon(R.drawable.close_blue)
+            override fun onTabReselected(tab: TabLayout.Tab) {
+                // Only display the view SSL certificate dialog if the current WebView is not null.
+                // This can happen if the tab is programmatically reselected while the app is being restarted and is not yet populated.
+                if (currentWebView != null) {
+                    // Instantiate the View SSL Certificate dialog.
+                    val viewSslCertificateDialogFragment: DialogFragment = ViewSslCertificateDialog.displayDialog(currentWebView!!.webViewFragmentId, currentWebView!!.getFavoriteIcon())
+
+                    // Display the View SSL Certificate dialog.
+                    viewSslCertificateDialogFragment.show(supportFragmentManager, getString(R.string.view_ssl_certificate))
+                }
+            }
+        })
 
-            // `invalidateOptionsMenu()` calls `onPrepareOptionsMenu()` and redraws the icons in the app bar.
-            if (runInvalidateOptionsMenu)
-                invalidateOptionsMenu()
-        }
-    }
+        // Set a touch listener on the bookmarks header linear layout so that touches don't pass through to the button underneath.
+        bookmarksHeaderLinearLayout.setOnTouchListener { _: View?, _: MotionEvent? -> true }
 
-    private fun loadBookmarksFolder() {
-        // Update the bookmarks cursor with the contents of the bookmarks database for the current folder.
-        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolder)
+        // Set the launch bookmarks activity floating action button to launch the bookmarks activity.
+        launchBookmarksActivityFab.setOnClickListener {
+            // Get a copy of the favorite icon bitmap.
+            val currentFavoriteIconBitmap = currentWebView!!.getFavoriteIcon()
 
-        // Populate the bookmarks cursor adapter.
-        bookmarksCursorAdapter = object : CursorAdapter(this, bookmarksCursor, false) {
-            override fun newView(context: Context, cursor: Cursor, parent: ViewGroup): View {
-                // Inflate the individual item layout.
-                return layoutInflater.inflate(R.layout.bookmarks_drawer_item_linearlayout, parent, false)
-            }
+            // Create a favorite icon byte array output stream.
+            val currentFavoriteIconByteArrayOutputStream = ByteArrayOutputStream()
 
-            override fun bindView(view: View, context: Context, cursor: Cursor) {
-                // Get handles for the views.
-                val bookmarkFavoriteIcon = view.findViewById<ImageView>(R.id.bookmark_favorite_icon)
-                val bookmarkNameTextView = view.findViewById<TextView>(R.id.bookmark_name)
+            // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+            currentFavoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, currentFavoriteIconByteArrayOutputStream)
 
-                // Get the favorite icon byte array from the cursor.
-                val favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.FAVORITE_ICON))
+            // Convert the favorite icon byte array stream to a byte array.
+            val currentFavoriteIconByteArray = currentFavoriteIconByteArrayOutputStream.toByteArray()
 
-                // Convert the byte array to a bitmap beginning at the first byte and ending at the last.
-                val favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.size)
+            // Create an intent to launch the bookmarks activity.
+            val bookmarksIntent = Intent(applicationContext, BookmarksActivity::class.java)
 
-                // Display the bitmap in the bookmark favorite icon.
-                bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap)
+            // Add the extra information to the intent.
+            bookmarksIntent.putExtra(CURRENT_FOLDER_ID, currentBookmarksFolderId)
+            bookmarksIntent.putExtra(CURRENT_TITLE, currentWebView!!.title)
+            bookmarksIntent.putExtra(CURRENT_URL, currentWebView!!.url)
+            bookmarksIntent.putExtra(CURRENT_FAVORITE_ICON_BYTE_ARRAY, currentFavoriteIconByteArray)
 
-                // Display the bookmark name from the cursor in the bookmark name text view.
-                bookmarkNameTextView.text = cursor.getString(cursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.BOOKMARK_NAME))
-
-                // Make the font bold for folders.
-                if (cursor.getInt(cursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.IS_FOLDER)) == 1)
-                    bookmarkNameTextView.typeface = Typeface.DEFAULT_BOLD
-                else  // Reset the font to default for normal bookmarks.
-                    bookmarkNameTextView.typeface = Typeface.DEFAULT
-            }
+            // Make it so.
+            startActivity(bookmarksIntent)
         }
 
-        // Populate the list view with the adapter.
-        bookmarksListView.adapter = bookmarksCursorAdapter
-
-        // Set the bookmarks drawer title.
-        if (currentBookmarksFolder.isEmpty())
-            bookmarksTitleTextView.setText(R.string.bookmarks)
-        else
-            bookmarksTitleTextView.text = currentBookmarksFolder
-    }
-
-    private fun openWithApp(url: String) {
-        // Create an open with app intent with `ACTION_VIEW`.
-        val openWithAppIntent = Intent(Intent.ACTION_VIEW)
+        // Set the create new bookmark folder floating action button to display an alert dialog.
+        createBookmarkFolderFab.setOnClickListener {
+            // Create a create bookmark folder dialog.
+            val createBookmarkFolderDialog: DialogFragment = CreateBookmarkFolderDialog.createBookmarkFolder(currentWebView!!.getFavoriteIcon())
 
-        // Set the URI but not the MIME type.  This should open all available apps.
-        openWithAppIntent.data = Uri.parse(url)
+            // Show the create bookmark folder dialog.
+            createBookmarkFolderDialog.show(supportFragmentManager, getString(R.string.create_folder))
+        }
 
-        // Flag the intent to open in a new task.
-        openWithAppIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+        // Set the create new bookmark floating action button to display an alert dialog.
+        createBookmarkFab.setOnClickListener {
+            // Instantiate the create bookmark dialog.
+            val createBookmarkDialog: DialogFragment = CreateBookmarkDialog.createBookmark(currentWebView!!.url!!, currentWebView!!.title!!, currentWebView!!.getFavoriteIcon())
 
-        // Try the intent.
-        try {
-            // Show the chooser.
-            startActivity(openWithAppIntent)
-        } catch (exception: ActivityNotFoundException) {  // There are no apps available to open the URL.
-            // Show a snackbar with the error.
-            Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+            // Display the create bookmark dialog.
+            createBookmarkDialog.show(supportFragmentManager, getString(R.string.create_bookmark))
         }
-    }
 
-    private fun openWithBrowser(url: String) {
+        // Search for the string on the page whenever a character changes in the find on page edit text.
+        findOnPageEditText.addTextChangedListener(object : TextWatcher {
+            override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
 
-        // Create an open with browser intent with `ACTION_VIEW`.
-        val openWithBrowserIntent = Intent(Intent.ACTION_VIEW)
+            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
 
-        // Set the URI and the MIME type.  `"text/html"` should load browser options.
-        openWithBrowserIntent.setDataAndType(Uri.parse(url), "text/html")
+            override fun afterTextChanged(s: Editable) {
+                // Search for the text in the WebView if it is not null.  Sometimes on resume after a period of non-use the WebView will be null.
+                currentWebView?.findAllAsync(findOnPageEditText.text.toString())
+            }
+        })
 
-        // Flag the intent to open in a new task.
-        openWithBrowserIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+        // Set the `check mark` button for the find on page edit text keyboard to close the soft keyboard.
+        findOnPageEditText.setOnKeyListener { _: View?, keyCode: Int, keyEvent: KeyEvent ->
+            if ((keyEvent.action == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The `enter` key was pressed.
+                // Hide the soft keyboard.
+                inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
 
-        // Try the intent.
-        try {
-            // Show the chooser.
-            startActivity(openWithBrowserIntent)
-        } catch (exception: ActivityNotFoundException) {  // There are no browsers available to open the URL.
-            // Show a snackbar with the error.
-            Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                // Consume the event.
+                return@setOnKeyListener true
+            } else {  // A different key was pressed.
+                // Do not consume the event.
+                return@setOnKeyListener false
+            }
         }
-    }
 
-    private fun sanitizeUrl(urlString: String): String {
-        // Initialize a sanitized URL string.
-        var sanitizedUrlString = urlString
+        // Implement swipe to refresh.
+        swipeRefreshLayout.setOnRefreshListener {
+            // Reload the website.
+            currentWebView!!.reload()
+        }
 
-        // Sanitize tracking queries.
-        if (sanitizeTrackingQueries)
-            sanitizedUrlString = SanitizeUrlHelper.sanitizeTrackingQueries(sanitizedUrlString)
+        // Store the default progress view offsets.
+        defaultProgressViewStartOffset = swipeRefreshLayout.progressViewStartOffset
+        defaultProgressViewEndOffset = swipeRefreshLayout.progressViewEndOffset
 
-        // Sanitize AMP redirects.
-        if (sanitizeAmpRedirects)
-            sanitizedUrlString = SanitizeUrlHelper.sanitizeAmpRedirects(sanitizedUrlString)
+        // Set the refresh color scheme according to the theme.
+        swipeRefreshLayout.setColorSchemeResources(R.color.blue_text)
 
-        // Return the sanitized URL string.
-        return sanitizedUrlString
-    }
+        // Initialize a color background typed value.
+        val colorBackgroundTypedValue = TypedValue()
 
-    override fun finishedPopulatingBlocklists(combinedBlocklists: ArrayList<ArrayList<List<Array<String>>>>) {
-        // Store the blocklists.
-        easyList = combinedBlocklists[0]
-        easyPrivacy = combinedBlocklists[1]
-        fanboysAnnoyanceList = combinedBlocklists[2]
-        fanboysSocialList = combinedBlocklists[3]
-        ultraList = combinedBlocklists[4]
-        ultraPrivacy = combinedBlocklists[5]
+        // Get the color background from the theme.
+        theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
 
-        // Check to see if the activity has been restarted with a saved state.
-        if ((savedStateArrayList == null) || (savedStateArrayList!!.size == 0)) {  // The activity has not been restarted or it was restarted on start to change the theme.
-            // Add the first tab.
-            addNewTab("", true)
-        } else {  // The activity has been restarted.
-            // Restore each tab.
-            for (i in savedStateArrayList!!.indices) {
-                // Add a new tab.
-                tabLayout.addTab(tabLayout.newTab())
+        // Get the color background int from the typed value.
+        val colorBackgroundInt = colorBackgroundTypedValue.data
 
-                // Get the new tab.
-                val newTab = tabLayout.getTabAt(i)!!
+        // Set the swipe refresh background color.
+        swipeRefreshLayout.setProgressBackgroundColorSchemeColor(colorBackgroundInt)
 
-                // Set a custom view on the new tab.
-                newTab.setCustomView(R.layout.tab_custom_view)
+        // Set the drawer titles, which identify the drawer layouts in accessibility mode.
+        drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer))
+        drawerLayout.setDrawerTitle(GravityCompat.END, getString(R.string.bookmarks))
 
-                // Add the new page.
-                webViewPagerAdapter!!.restorePage(savedStateArrayList!![i], savedNestedScrollWebViewStateArrayList!![i])
-            }
+        // Load the bookmarks folder.
+        loadBookmarksFolder()
 
-            // Reset the saved state variables.
-            savedStateArrayList = null
-            savedNestedScrollWebViewStateArrayList = null
+        // Handle clicks on bookmarks.
+        bookmarksListView.onItemClickListener = AdapterView.OnItemClickListener { _: AdapterView<*>?, _: View?, _: Int, id: Long ->
+            // Convert the id from long to int to match the format of the bookmarks database.
+            val databaseId = id.toInt()
 
-            // Restore the selected tab position.
-            if (savedTabPosition == 0) {  // The first tab is selected.
-                // Set the first page as the current WebView.
-                setCurrentWebView(0)
-            } else {  // The first tab is not selected.
-                // Move to the selected tab.
-                webViewPager.currentItem = savedTabPosition
-            }
+            // Get the bookmark cursor for this ID.
+            val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
 
-            // Get the intent that started the app.
-            val intent = intent
+            // Move the bookmark cursor to the first row.
+            bookmarkCursor.moveToFirst()
 
-            // Reset the intent.  This prevents a duplicate tab from being created on restart.
-            setIntent(Intent())
+            // Act upon the bookmark according to the type.
+            if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndexOrThrow(IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
+                // Store the folder ID.
+                currentBookmarksFolderId = bookmarkCursor.getLong(bookmarkCursor.getColumnIndexOrThrow(FOLDER_ID))
 
-            // Get the information from the intent.
-            val intentAction = intent.action
-            val intentUriData = intent.data
-            val intentStringExtra = intent.getStringExtra(Intent.EXTRA_TEXT)
+                // Load the new folder.
+                loadBookmarksFolder()
+            } else {  // The selected bookmark is not a folder.
+                // Load the bookmark URL.
+                loadUrl(currentWebView!!, bookmarkCursor.getString(bookmarkCursor.getColumnIndexOrThrow(BOOKMARK_URL)))
 
-            // Determine if this is a web search.
-            val isWebSearch = (intentAction != null) && (intentAction == Intent.ACTION_WEB_SEARCH)
+                // Close the bookmarks drawer if it is not pinned.
+                if (!bookmarksDrawerPinned)
+                    drawerLayout.closeDrawer(GravityCompat.END)
+            }
 
-            // Only process the URI if it contains data or it is a web search.  If the user pressed the desktop icon after the app was already running the URI will be null.
-            if ((intentUriData != null) || (intentStringExtra != null) || isWebSearch) {
-                // Get the URL string.
-                val urlString = if (isWebSearch) {  // The intent is a web search.
-                    // Sanitize the search input.
-                    val encodedSearchString: String = try {
-                        URLEncoder.encode(intent.getStringExtra(SearchManager.QUERY), "UTF-8")
-                    } catch (exception: UnsupportedEncodingException) {
-                        ""
-                    }
+            // Close the cursor.
+            bookmarkCursor.close()
+        }
 
-                    // Add the base search URL.
-                    searchURL + encodedSearchString
-                } else { // The intent contains a URL formatted as a URI or a URL in the string extra.
-                    // Get the URL string.
-                    intentUriData?.toString() ?: intentStringExtra!!
-                }
+        // Handle long-presses on bookmarks.
+        bookmarksListView.onItemLongClickListener = AdapterView.OnItemLongClickListener { _: AdapterView<*>?, _: View?, _: Int, id: Long ->
+            // Convert the database ID from `long` to `int`.
+            val databaseId = id.toInt()
 
-                // Add a new tab if specified in the preferences.
-                if (sharedPreferences.getBoolean(getString(R.string.open_intents_in_new_tab_key), true)) {  // Load the URL in a new tab.
-                    // Set the loading new intent flag.
-                    loadingNewIntent = true
+            // Run the commands associated with the type.
+            if (bookmarksDatabaseHelper!!.isFolder(databaseId)) {  // The bookmark is a folder.
+                // Get the folder ID.
+                val folderId = bookmarksDatabaseHelper!!.getFolderId(databaseId)
 
-                    // Add a new tab.
-                    addNewTab(urlString, true)
-                } else {  // Load the URL in the current tab.
-                    // Make it so.
-                    loadUrl(currentWebView!!, urlString)
-                }
-            }
-        }
-    }
+                // Get a cursor of all the bookmarks in the folder.
+                val bookmarksCursor = bookmarksDatabaseHelper!!.getFolderBookmarks(folderId)
 
-    // The view parameter cannot be removed because it is called from the layout onClick.
-    fun addTab(@Suppress("UNUSED_PARAMETER")view: View?) {
-        // Add a new tab with a blank URL.
-        addNewTab("", true)
-    }
+                // Move to the first entry in the cursor.
+                bookmarksCursor.moveToFirst()
 
-    private fun addNewTab(urlString: String, moveToTab: Boolean) {
-        // Clear the focus from the URL edit text, so that it will be populated with the information from the new tab.
-        urlEditText.clearFocus()
+                // Open each bookmark
+                for (i in 0 until bookmarksCursor.count) {
+                    // Load the bookmark in a new tab, moving to the tab for the first bookmark if the drawer is not pinned.
+                    addNewPage(bookmarksCursor.getString(bookmarksCursor.getColumnIndexOrThrow(BOOKMARK_URL)), adjacent = false, moveToTab = !bookmarksDrawerPinned && (i == 0))
 
-        // Get the new page number.  The page numbers are 0 indexed, so the new page number will match the current count.
-        val newTabNumber = tabLayout.tabCount
+                    // Move to the next bookmark.
+                    bookmarksCursor.moveToNext()
+                }
 
-        // Add a new tab.
-        tabLayout.addTab(tabLayout.newTab())
+                // Close the cursor.
+                bookmarksCursor.close()
+            } else {  // The bookmark is not a folder.
+                // Get the bookmark cursor for this ID.
+                val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
 
-        // Get the new tab.
-        val newTab = tabLayout.getTabAt(newTabNumber)!!
+                // Move the bookmark cursor to the first row.
+                bookmarkCursor.moveToFirst()
 
-        // Set a custom view on the new tab.
-        newTab.setCustomView(R.layout.tab_custom_view)
+                // Load the bookmark in a new tab and move to the tab if the drawer is not pinned.
+                addNewPage(bookmarkCursor.getString(bookmarkCursor.getColumnIndexOrThrow(BOOKMARK_URL)), adjacent = true, moveToTab = !bookmarksDrawerPinned)
 
-        // Add the new WebView page.
-        webViewPagerAdapter!!.addPage(newTabNumber, webViewPager, urlString, moveToTab)
+                // Close the cursor.
+                bookmarkCursor.close()
+            }
 
-        // Show the app bar if it is at the bottom of the screen and the new tab is taking focus.
-        if (bottomAppBar && moveToTab && appBarLayout.translationY != 0f) {
-            // Animate the bottom app bar onto the screen.
-            objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", 0f)
+            // Close the bookmarks drawer if it is not pinned.
+            if (!bookmarksDrawerPinned)
+                drawerLayout.closeDrawer(GravityCompat.END)
 
-            // Make it so.
-            objectAnimator.start()
+            // Consume the event.
+            true
         }
-    }
 
-    // The view parameter cannot be removed because it is called from the layout onClick.
-    fun closeTab(@Suppress("UNUSED_PARAMETER")view: View?) {
-        // Run the command according to the number of tabs.
-        if (tabLayout.tabCount > 1)  // There is more than one tab open.
-            closeCurrentTab()
-        else  // There is only one tab open.
-            clearAndExit()
-    }
+        // The drawer listener is used to update the navigation menu.
+        drawerLayout.addDrawerListener(object : DrawerLayout.DrawerListener {
+            override fun onDrawerSlide(drawerView: View, slideOffset: Float) {}
 
-    private fun closeCurrentTab() {
-        // Get the current tab number.
-        val currentTabNumber = tabLayout.selectedTabPosition
+            override fun onDrawerOpened(drawerView: View) {}
 
-        // Delete the current tab.
-        tabLayout.removeTabAt(currentTabNumber)
+            override fun onDrawerClosed(drawerView: View) {}
 
-        // Delete the current page.  If the selected page number did not change during the delete (because the newly selected tab has has same number as the previously deleted tab), it will return true,
-        // meaning that the current WebView must be reset.  Otherwise it will happen automatically as the selected tab number changes.
-        if (webViewPagerAdapter!!.deletePage(currentTabNumber, webViewPager))
-            setCurrentWebView(currentTabNumber)
-    }
+            override fun onDrawerStateChanged(newState: Int) {
+                if (newState == DrawerLayout.STATE_SETTLING || newState == DrawerLayout.STATE_DRAGGING) {  // A drawer is opening or closing.
+                    // Update the navigation menu items if the WebView is not null.
+                    if (currentWebView != null) {
+                        // Set the enabled status of the menu items.
+                        navigationBackMenuItem.isEnabled = currentWebView!!.canGoBack()
+                        navigationForwardMenuItem.isEnabled = currentWebView!!.canGoForward()
+                        navigationScrollToBottomMenuItem.isEnabled = (currentWebView!!.canScrollVertically(-1) || currentWebView!!.canScrollVertically(1))
+                        navigationHistoryMenuItem.isEnabled = currentWebView!!.canGoBack() || currentWebView!!.canGoForward()
 
-    private fun exitFullScreenVideo() {
-        // Re-enable the screen timeout.
-        fullScreenVideoFrameLayout.keepScreenOn = false
+                        // Update the scroll menu item.
+                        if (currentWebView!!.scrollY == 0) {  // The WebView is scrolled to the top.
+                            // Set the title.
+                            navigationScrollToBottomMenuItem.title = getString(R.string.scroll_to_bottom)
 
-        // Unset the full screen video flag.
-        displayingFullScreenVideo = false
+                            // Set the icon.
+                            navigationScrollToBottomMenuItem.icon = AppCompatResources.getDrawable(applicationContext, R.drawable.move_down_enabled)
+                        } else {  // The WebView is not scrolled to the top.
+                            // Set the title.
+                            navigationScrollToBottomMenuItem.title = getString(R.string.scroll_to_top)
 
-        // Remove all the views from the full screen video frame layout.
-        fullScreenVideoFrameLayout.removeAllViews()
+                            // Set the icon.
+                            navigationScrollToBottomMenuItem.icon = AppCompatResources.getDrawable(applicationContext, R.drawable.move_up_enabled)
+                        }
 
-        // Hide the full screen video frame layout.
-        fullScreenVideoFrameLayout.visibility = View.GONE
+                        // Display the number of blocked requests.
+                        navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + currentWebView!!.getRequestsCount(BLOCKED_REQUESTS)
 
-        // Enable the sliding drawers.
-        drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
+                        // Hide the keyboard (if displayed).
+                        inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
+                    }
 
-        // Show the coordinator layout.
-        coordinatorLayout.visibility = View.VISIBLE
+                    // Clear the focus from from the URL text box.  This removes any text selection markers and context menus, which otherwise draw above the open drawers.
+                    urlEditText.clearFocus()
 
-        // Apply the appropriate full screen mode flags.
-        if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {  // Privacy Browser is currently in full screen browsing mode.
-            // Hide the app bar if specified.
-            if (hideAppBar) {
-                // Hide the tab linear layout.
-                tabsLinearLayout.visibility = View.GONE
+                    // Clear the focus from from the WebView if it is not null, which can happen if a user opens a drawer while the browser is being resumed.
+                    // Clearing the focus from the WebView removes any text selection markers and context menus, which otherwise draw above the open drawers.
+                    currentWebView?.clearFocus()
 
-                // Hide the app bar.
-                appBar.hide()
+                    if (bottomAppBar && navigationDrawerFirstView) {
+                        // Reset the navigation drawer first view flag.
+                        navigationDrawerFirstView = false
+
+                        // Get a handle for the navigation recycler view.
+                        val navigationRecyclerView = navigationView.getChildAt(0) as RecyclerView
+
+                        // Get the navigation linear layout manager.
+                        val navigationLinearLayoutManager = navigationRecyclerView.layoutManager as LinearLayoutManager
+
+                        // Scroll the navigation drawer to the bottom.
+                        navigationLinearLayoutManager.scrollToPositionWithOffset(13, 0)
+                    }
+                }
             }
+        })
 
-            /* Hide the system bars.
-             * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-             * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
-             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-             */
+        // Inflate a bare WebView to get the default user agent.  It is not used to render content on the screen.
+        @SuppressLint("InflateParams") val webViewLayout = layoutInflater.inflate(R.layout.bare_webview, null, false)
 
-            // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-            @Suppress("DEPRECATION")
-            rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
-        } else {  // Switch to normal viewing mode.
-            // Remove the `SYSTEM_UI` flags from the root frame layout.  The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-            @Suppress("DEPRECATION")
-            rootFrameLayout.systemUiVisibility = 0
-        }
-    }
+        // Get a handle for the WebView.
+        val bareWebView = webViewLayout.findViewById<WebView>(R.id.bare_webview)
 
-    private fun clearAndExit() {
-        // Close the bookmarks cursor if it exists.
-        bookmarksCursor?.close()
+        // Store the default user agent.
+        webViewDefaultUserAgent = bareWebView.settings.userAgentString
 
-        // Close the databases helpers if they exist.
-        bookmarksDatabaseHelper?.close()
-        domainsDatabaseHelper?.close()
+        // Destroy the bare WebView.
+        bareWebView.destroy()
 
-        // Get the status of the clear everything preference.
-        val clearEverything = sharedPreferences.getBoolean(getString(R.string.clear_everything_key), true)
+        // Update the domains settings set.
+        updateDomainsSettingsSet()
 
-        // Get a handle for the runtime.
-        val runtime = Runtime.getRuntime()
+        // Instantiate the check filter list helper.
+        checkFilterListHelper = CheckFilterListHelper()
+    }
 
-        // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`,
-        // which links to `/data/data/com.stoutner.privacybrowser.standard`.
-        val privateDataDirectoryString = applicationInfo.dataDir
+    @SuppressLint("ClickableViewAccessibility")
+    override fun initializeWebView(nestedScrollWebView: NestedScrollWebView, pagePosition: Int, progressBar: ProgressBar, urlString: String, restoringState: Boolean) {
+        // Get the WebView theme.
+        val webViewTheme = sharedPreferences.getString(getString(R.string.webview_theme_key), getString(R.string.webview_theme_default_value))
 
-        // Clear cookies.
-        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_cookies_key), true)) {
-            // Ass the cookie manager to delete all the cookies.
-            cookieManager.removeAllCookies(null)
+        // Get the WebView theme entry values string array.
+        val webViewThemeEntryValuesStringArray = resources.getStringArray(R.array.webview_theme_entry_values)
 
-            // Ask the cookie manager to flush the cookie database.
-            cookieManager.flush()
+        // Set the WebView theme if algorithmic darkening is supported.
+        if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
+            // Set the WebView them.  A switch statement cannot be used because the WebView theme entry values string array is not a compile time constant.
+            if (webViewTheme == webViewThemeEntryValuesStringArray[1]) {  // The light theme is selected.
+                // Turn off algorithmic darkening.
+                WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
 
-            // Manually delete the cookies database, as the cookie manager sometimes will not flush its changes to disk before system exit is run.
-            try {
-                // Two commands must be used because `Runtime.exec()` does not like `*`.
-                val deleteCookiesProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/Cookies")
-                val deleteCookiesJournalProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/Cookies-journal")
+                // Make the WebView visible. The WebView was created invisible in `webview_framelayout` to prevent a white background splash in night mode.
+                // If the system is currently in night mode, showing the WebView will be handled in `onProgressChanged()`.
+                nestedScrollWebView.visibility = View.VISIBLE
+            } else if (webViewTheme == webViewThemeEntryValuesStringArray[2]) {  // The dark theme is selected.
+                // Turn on algorithmic darkening.
+                WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+            } else {  // The system default theme is selected.
+                // Get the current theme status.
+                val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
 
-                // Wait until the processes have finished.
-                deleteCookiesProcess.waitFor()
-                deleteCookiesJournalProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
+                // Set the algorithmic darkening according to the current system theme status.
+                if (currentThemeStatus == Configuration.UI_MODE_NIGHT_NO) {  // The system is in day mode.
+                    // Turn off algorithmic darkening.
+                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
+
+                    // Make the WebView visible. The WebView was created invisible in `webview_framelayout` to prevent a white background splash in night mode.
+                    // If the system is currently in night mode, showing the WebView will be handled in `onProgressChanged()`.
+                    nestedScrollWebView.visibility = View.VISIBLE
+                } else {  // The system is in night mode.
+                    // Turn on algorithmic darkening.
+                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+                }
             }
         }
 
-        // Clear DOM storage.
-        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_dom_storage_key), true)) {
-            // Ask web storage to clear the DOM storage.
-            WebStorage.getInstance().deleteAllData()
+        // Get a handle for the input method manager.
+        val inputMethodManager = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
 
-            // Manually delete the DOM storage files and directories, as web storage sometimes will not flush its changes to disk before system exit is run.
-            try {
-                // A string array must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
-                val deleteLocalStorageProcess = runtime.exec(arrayOf("rm", "-rf", "$privateDataDirectoryString/app_webview/Local Storage/"))
+        // Set the app bar scrolling.
+        nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
 
-                // Multiple commands must be used because `Runtime.exec()` does not like `*`.
-                val deleteIndexProcess = runtime.exec("rm -rf $privateDataDirectoryString/app_webview/IndexedDB")
-                val deleteQuotaManagerProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/QuotaManager")
-                val deleteQuotaManagerJournalProcess = runtime.exec("rm -f $privateDataDirectoryString/app_webview/QuotaManager-journal")
-                val deleteDatabaseProcess = runtime.exec("rm -rf $privateDataDirectoryString/app_webview/databases")
+        // Allow pinch to zoom.
+        nestedScrollWebView.settings.builtInZoomControls = true
 
-                // Wait until the processes have finished.
-                deleteLocalStorageProcess.waitFor()
-                deleteIndexProcess.waitFor()
-                deleteQuotaManagerProcess.waitFor()
-                deleteQuotaManagerJournalProcess.waitFor()
-                deleteDatabaseProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
-            }
-        }
+        // Hide zoom controls.
+        nestedScrollWebView.settings.displayZoomControls = false
 
-        // Clear form data if the API < 26.
-        if (Build.VERSION.SDK_INT < 26 && (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_form_data_key), true))) {
-            // Ask the WebView database to clear the form data.
-            @Suppress("DEPRECATION")
-            WebViewDatabase.getInstance(this).clearFormData()
+        // Don't allow mixed content (HTTP and HTTPS) on the same website.
+        nestedScrollWebView.settings.mixedContentMode = WebSettings.MIXED_CONTENT_NEVER_ALLOW
 
-            // Manually delete the form data database, as the WebView database sometimes will not flush its changes to disk before system exit is run.
-            try {
-                // A string array must be used because the database contains a space and `Runtime.exec` will not otherwise escape the string correctly.
-                val deleteWebDataProcess = runtime.exec(arrayOf("rm", "-f", "$privateDataDirectoryString/app_webview/Web Data"))
-                val deleteWebDataJournalProcess = runtime.exec(arrayOf("rm", "-f", "$privateDataDirectoryString/app_webview/Web Data-journal"))
+        // Set the WebView to load in overview mode (zoomed out to the maximum width).
+        nestedScrollWebView.settings.loadWithOverviewMode = true
 
-                // Wait until the processes have finished.
-                deleteWebDataProcess.waitFor()
-                deleteWebDataJournalProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
+        // Explicitly disable geolocation.
+        nestedScrollWebView.settings.setGeolocationEnabled(false)
+
+        // Allow loading of file:// URLs.  This is necessary for opening MHT web archives, which are copied into a temporary cache location.
+        nestedScrollWebView.settings.allowFileAccess = true
+
+        // Create a double-tap gesture detector to toggle full-screen mode.
+        val doubleTapGestureDetector = GestureDetector(this, object : GestureDetector.SimpleOnGestureListener() {
+            // Override `onDoubleTap()`.  All other events are handled using the default settings.
+            override fun onDoubleTap(motionEvent: MotionEvent): Boolean {
+                return if (fullScreenBrowsingModeEnabled) {  // Only process the double-tap if full screen browsing mode is enabled.
+                    // Toggle the full screen browsing mode tracker.
+                    inFullScreenBrowsingMode = !inFullScreenBrowsingMode
+
+                    // Toggle the full screen browsing mode.
+                    if (inFullScreenBrowsingMode) {  // Switch to full screen mode.
+                        // Hide the app bar if specified.
+                        if (hideAppBar) {  // App bar hiding is enabled.
+                            // Close the find on page bar if it is visible.
+                            closeFindOnPage(null)
+
+                            // Hide the tab linear layout.
+                            tabsLinearLayout.visibility = View.GONE
+
+                            // Hide the app bar.
+                            appBar.hide()
+
+                            // Set layout and scrolling parameters according to the position of the app bar.
+                            if (bottomAppBar) {  // The app bar is at the bottom.
+                                // Reset the WebView padding to fill the available space.
+                                swipeRefreshLayout.setPadding(0, 0, 0, 0)
+                            } else {  // The app bar is at the top.
+                                // Check to see if the app bar is normally scrolled.
+                                if (scrollAppBar) {  // The app bar is scrolled when it is displayed.
+                                    // Get the swipe refresh layout parameters.
+                                    val swipeRefreshLayoutParams = swipeRefreshLayout.layoutParams as CoordinatorLayout.LayoutParams
+
+                                    // Remove the off-screen scrolling layout.
+                                    swipeRefreshLayoutParams.behavior = null
+                                } else {  // The app bar is not scrolled when it is displayed.
+                                    // Remove the padding from the top of the swipe refresh layout.
+                                    swipeRefreshLayout.setPadding(0, 0, 0, 0)
+
+                                    // The swipe refresh circle must be moved above the now removed status bar location.
+                                    swipeRefreshLayout.setProgressViewOffset(false, -200, defaultProgressViewEndOffset)
+                                }
+                            }
+                        } else {  // App bar hiding is not enabled.
+                            // Adjust the UI for the bottom app bar.
+                            if (bottomAppBar) {
+                                // Adjust the UI according to the scrolling of the app bar.
+                                if (scrollAppBar) {
+                                    // Reset the WebView padding to fill the available space.
+                                    swipeRefreshLayout.setPadding(0, 0, 0, 0)
+                                } else {
+                                    // Move the WebView above the app bar layout.
+                                    swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
+                                }
+                            }
+                        }
+
+                        /* Hide the system bars.
+                         * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+                         * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+                         * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+                         * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+                         */
+
+                        // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+                        @Suppress("DEPRECATION")
+                        rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+                    } else {  // Switch to normal viewing mode.
+                        // Show the app bar if it was hidden.
+                        if (hideAppBar) {
+                            // Show the tab linear layout.
+                            tabsLinearLayout.visibility = View.VISIBLE
+
+                            // Show the app bar.
+                            appBar.show()
+                        }
+
+                        // Set layout and scrolling parameters according to the position of the app bar.
+                        if (bottomAppBar) {  // The app bar is at the bottom.
+                            // Adjust the UI.
+                            if (scrollAppBar) {
+                                // Reset the WebView padding to fill the available space.
+                                swipeRefreshLayout.setPadding(0, 0, 0, 0)
+                            } else {
+                                // Move the WebView above the app bar layout.
+                                swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
+                            }
+                        } else {  // The app bar is at the top.
+                            // Check to see if the app bar is normally scrolled.
+                            if (scrollAppBar) {  // The app bar is scrolled when it is displayed.
+                                // Get the swipe refresh layout parameters.
+                                val swipeRefreshLayoutParams = swipeRefreshLayout.layoutParams as CoordinatorLayout.LayoutParams
+
+                                // Add the off-screen scrolling layout.
+                                swipeRefreshLayoutParams.behavior = AppBarLayout.ScrollingViewBehavior()
+                            } else {  // The app bar is not scrolled when it is displayed.
+                                // The swipe refresh layout must be manually moved below the app bar layout.
+                                swipeRefreshLayout.setPadding(0, appBarHeight, 0, 0)
+
+                                // The swipe to refresh circle doesn't always hide itself completely unless it is moved up 10 pixels.
+                                swipeRefreshLayout.setProgressViewOffset(false, defaultProgressViewStartOffset - 10 + appBarHeight, defaultProgressViewEndOffset + appBarHeight)
+                            }
+                        }
+
+                        // Remove the `SYSTEM_UI` flags from the root frame layout.  The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+                        @Suppress("DEPRECATION")
+                        rootFrameLayout.systemUiVisibility = 0
+                    }
+
+                    // Consume the double-tap.
+                    true
+                } else { // Do not consume the double-tap because full screen browsing mode is disabled.
+                    // Return false.
+                    false
+                }
             }
-        }
 
-        // Clear the logcat.
-        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_logcat_key), true)) {
-            try {
-                // Clear the logcat.  `-c` clears the logcat.  `-b all` clears all the buffers (instead of just crash, main, and system).
-                val process = Runtime.getRuntime().exec("logcat -b all -c")
+            override fun onFling(motionEvent1: MotionEvent?, motionEvent2: MotionEvent, velocityX: Float, velocityY: Float): Boolean {
+                // Scroll the bottom app bar if enabled.
+                if (bottomAppBar && scrollAppBar && !objectAnimator.isRunning && (motionEvent1 != null)) {
+                    // Calculate the Y change.
+                    val motionY = motionEvent2.y - motionEvent1.y
 
-                // Wait for the process to finish.
-                process.waitFor()
-            } catch (exception: IOException) {
-                // Do nothing.
-            } catch (exception: InterruptedException) {
-                // Do nothing.
+                    // Scroll the app bar if the change is greater than 50 pixels.
+                    if (motionY > 50) {
+                        // Animate the bottom app bar onto the screen.
+                        objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", 0f)
+                    } else if (motionY < -50) {
+                        // Animate the bottom app bar off the screen.
+                        objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", appBarLayout.height.toFloat())
+                    }
+
+                    // Make it so.
+                    objectAnimator.start()
+                }
+
+                // Do not consume the event.
+                return false
             }
+        })
+
+        // Pass all touch events on the WebView through the double-tap gesture detector.
+        nestedScrollWebView.setOnTouchListener { view: View, motionEvent: MotionEvent? ->
+            // Call `performClick()` on the view, which is required for accessibility.
+            view.performClick()
+
+            // Check for double-taps.
+            doubleTapGestureDetector.onTouchEvent(motionEvent!!)
         }
 
-        // Clear the cache.
-        if (clearEverything || sharedPreferences.getBoolean(getString(R.string.clear_cache_key), true)) {
-            // Clear the cache from each WebView.
-            for (i in 0 until webViewPagerAdapter!!.count) {
-                // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+        // Register the WebView for a context menu.  This is used to see link targets and download images.
+        registerForContextMenu(nestedScrollWebView)
 
-                // Get the WebView fragment view.
-                val webViewFragmentView = webViewTabFragment.view
+        // Allow the downloading of files.
+        nestedScrollWebView.setDownloadListener { downloadUrlString: String, userAgent: String, contentDisposition: String, mimetype: String, contentLength: Long ->
+            // Use the specified download provider.
+            if (downloadWithExternalApp) {  // Download with an external app.
+                // Download with an external app.
+                saveWithExternalApp(downloadUrlString)
+            } else {  // Download with Privacy Browser or Android's download manager.
+                // Process the content length if it contains data.
+                val formattedFileSizeString = if (contentLength > 0) {  // The content length is greater than 0.
+                    // Format the content length as a string.
+                    NumberFormat.getInstance().format(contentLength) + " " + getString(R.string.bytes)
+                } else {  // The content length is not greater than 0.
+                    // Set the formatted file size string to be `unknown size`.
+                    getString(R.string.unknown_size)
+                }
 
-                // Only clear the cache if the WebView exists.
-                if (webViewFragmentView != null) {
-                    // Get the nested scroll WebView from the tab fragment.
-                    val nestedScrollWebView = webViewFragmentView.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
+                // Get the file name from the content disposition.
+                val fileNameString = UrlHelper.getFileName(this, contentDisposition, mimetype, downloadUrlString)
 
-                    // Clear the cache for this WebView.
-                    nestedScrollWebView.clearCache(true)
+                // Instantiate the save dialog according.
+                val saveDialogFragment = SaveDialog.saveUrl(downloadUrlString, fileNameString, formattedFileSizeString, userAgent, nestedScrollWebView.acceptCookies)
+
+                // Try to show the dialog.  The download listener continues to function even when the WebView is paused.  Attempting to display a dialog in that state leads to a crash.
+                try {
+                    // Show the save dialog.
+                    saveDialogFragment.show(supportFragmentManager, getString(R.string.save_dialog))
+                } catch (exception: Exception) {  // The dialog could not be shown.
+                    // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
+                    pendingDialogsArrayList.add(PendingDialogDataClass(saveDialogFragment, getString(R.string.save_dialog)))
                 }
             }
 
-            // Manually delete the cache directories.
-            try {
-                // Delete the main cache directory.
-                val deleteCacheProcess = runtime.exec("rm -rf $privateDataDirectoryString/cache")
-
-                // Delete the secondary `Service Worker` cache directory.
-                // A string array must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
-                val deleteServiceWorkerProcess = runtime.exec(arrayOf("rm", "-rf", "$privateDataDirectoryString/app_webview/Default/Service Worker/"))
+            // Get the current page position.
+            val currentPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-                // Wait until the processes have finished.
-                deleteCacheProcess.waitFor()
-                deleteServiceWorkerProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
-            }
-        }
+            // Get the corresponding tab.
+            val tab = tabLayout.getTabAt(currentPagePosition)!!
 
-        // Wipe out each WebView.
-        for (i in 0 until webViewPagerAdapter!!.count) {
-            // Get the WebView tab fragment.
-            val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+            // Get the tab custom view.
+            val tabCustomView = tab.customView!!
 
-            // Get the WebView frame layout.
-            val webViewFrameLayout = webViewTabFragment.view as FrameLayout?
+            // Get the tab views.
+            val tabFavoriteIconImageView = tabCustomView.findViewById<ImageView>(R.id.favorite_icon_imageview)
+            val tabTitleTextView = tabCustomView.findViewById<TextView>(R.id.title_textview)
 
-            // Only wipe out the WebView if it exists.
-            if (webViewFrameLayout != null) {
-                // Get the nested scroll WebView from the tab fragment.
-                val nestedScrollWebView = webViewFrameLayout.findViewById<NestedScrollWebView>(R.id.nestedscroll_webview)
+            // Restore the previous webpage favorite icon and title if the title is currently set to `Loading...`.
+            if (tabTitleTextView.text.toString() == getString(R.string.loading)) {
+                // Restore the previous webpage title text.
+                tabTitleTextView.text = nestedScrollWebView.previousWebpageTitle
 
-                // Clear SSL certificate preferences for this WebView.
-                nestedScrollWebView.clearSslPreferences()
+                // Restore the previous webpage favorite icon if it is not null.
+                if (nestedScrollWebView.previousFavoriteIconDrawable != null)
+                    tabFavoriteIconImageView.setImageDrawable(nestedScrollWebView.previousFavoriteIconDrawable)
+            }
+        }
 
-                // Clear the back/forward history for this WebView.
-                nestedScrollWebView.clearHistory()
+        // Update the find on page count.
+        nestedScrollWebView.setFindListener { activeMatchOrdinal, numberOfMatches, isDoneCounting ->
+            if (isDoneCounting && (numberOfMatches == 0)) {  // There are no matches.
+                // Set the find on page count text view to be `0/0`.
+                findOnPageCountTextView.setText(R.string.zero_of_zero)
+            } else if (isDoneCounting) {  // There are matches.
+                // The active match ordinal is zero-based.
+                val activeMatch = activeMatchOrdinal + 1
 
-                // Remove all the views from the frame layout.
-                webViewFrameLayout.removeAllViews()
+                // Build the match string.
+                val matchString = "$activeMatch/$numberOfMatches"
 
-                // Destroy the internal state of the WebView.
-                nestedScrollWebView.destroy()
+                // Update the find on page count text view.
+                findOnPageCountTextView.text = matchString
             }
         }
 
-        // Manually delete the `app_webview` folder, which contains the cookies, DOM storage, form data, and `Service Worker` cache.
-        // See `https://code.google.com/p/android/issues/detail?id=233826&thanks=233826&ts=1486670530`.
-        if (clearEverything) {
-            try {
-                // Delete the folder.
-                val deleteAppWebviewProcess = runtime.exec("rm -rf $privateDataDirectoryString/app_webview")
+        // Process scroll changes.
+        nestedScrollWebView.setOnScrollChangeListener { _: View?, _: Int, _: Int, _: Int, _: Int ->
+            // Set the swipe to refresh status.
+            if (nestedScrollWebView.swipeToRefresh)  // Only enable swipe to refresh if the WebView is scrolled to the top.
+                swipeRefreshLayout.isEnabled = nestedScrollWebView.scrollY == 0
+            else  // Disable swipe to refresh.
+                swipeRefreshLayout.isEnabled = false
 
-                // Wait until the process has finished.
-                deleteAppWebviewProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
+            // Reinforce the system UI visibility flags if in full screen browsing mode.
+            // This hides the status and navigation bars, which are displayed if other elements are shown, like dialog boxes, the options menu, or the keyboard.
+            if (inFullScreenBrowsingMode) {
+                /* Hide the system bars.
+                 * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+                 * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+                 * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+                 * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+                 */
+
+                // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+                @Suppress("DEPRECATION")
+                rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
             }
         }
 
-        // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
-        finishAndRemoveTask()
+        // Set the web chrome client.
+        nestedScrollWebView.webChromeClient = object : WebChromeClient() {
+            // Update the progress bar when a page is loading.
+            override fun onProgressChanged(view: WebView, progress: Int) {
+                // Update the progress bar.
+                progressBar.progress = progress
 
-        // Remove the terminated program from RAM.  The status code is `0`.
-        exitProcess(0)
-    }
+                // Set the visibility of the progress bar.
+                if (progress < 100) {
+                    // Show the progress bar.
+                    progressBar.visibility = View.VISIBLE
+                } else {
+                    // Hide the progress bar.
+                    progressBar.visibility = View.GONE
 
-    // The view parameter cannot be removed because it is called from the layout onClick.
-    fun bookmarksBack(@Suppress("UNUSED_PARAMETER")view: View?) {
-        if (currentBookmarksFolder.isEmpty()) {  // The home folder is displayed.
-            // close the bookmarks drawer.
-            drawerLayout.closeDrawer(GravityCompat.END)
-        } else {  // A subfolder is displayed.
-            // Set the former parent folder as the current folder.
-            currentBookmarksFolder = bookmarksDatabaseHelper!!.getParentFolderName(currentBookmarksFolder)
+                    //Stop the swipe to refresh indicator if it is running
+                    swipeRefreshLayout.isRefreshing = false
 
-            // Load the new folder.
-            loadBookmarksFolder()
-        }
-    }
+                    // Make the current WebView visible.  If this is a new tab, the current WebView would have been created invisible in `webview_framelayout` to prevent a white background splash in night mode.
+                    nestedScrollWebView.visibility = View.VISIBLE
+                }
+            }
 
-        // The view parameter cannot be removed because it is called from the layout onClick.
-    fun toggleBookmarksDrawerPinned(@Suppress("UNUSED_PARAMETER")view: View?) {
-        // Toggle the bookmarks drawer pinned tracker.
-        bookmarksDrawerPinned = !bookmarksDrawerPinned
+            // Set the favorite icon when it changes.
+            override fun onReceivedIcon(view: WebView, icon: Bitmap) {
+                // Only update the favorite icon if the website has finished loading and the new favorite icon height is greater than the current favorite icon height.
+                // This prevents low resolution icons from replacing high resolution one.
+                // The check for the visibility of the progress bar can possibly be removed once https://redmine.stoutner.com/issues/747 is fixed.
+                if ((progressBar.visibility == View.GONE) && (icon.height > nestedScrollWebView.getFavoriteIconHeight())) {
+                    // Store the new favorite icon.
+                    nestedScrollWebView.setFavoriteIcon(icon)
 
-        // Update the bookmarks drawer pinned image view.
-        updateBookmarksDrawerPinnedImageView()
-    }
+                    // Get the current page position.
+                    val currentPosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-    private fun updateBookmarksDrawerPinnedImageView() {
-        // Set the current icon.
-        if (bookmarksDrawerPinned)
-            bookmarksDrawerPinnedImageView.setImageResource(R.drawable.pin_selected)
-        else
-            bookmarksDrawerPinnedImageView.setImageResource(R.drawable.pin)
-    }
+                    // Get the current tab.
+                    val tab = tabLayout.getTabAt(currentPosition)
 
-    private fun setCurrentWebView(pageNumber: Int) {
-        // Stop the swipe to refresh indicator if it is running
-        swipeRefreshLayout.isRefreshing = false
+                    // Check to see if the tab has been populated.
+                    if (tab != null) {
+                        // Get the custom view from the tab.
+                        val tabView = tab.customView
 
-        // Get the WebView tab fragment.
-        val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(pageNumber)
+                        // Check to see if the custom tab view has been populated.
+                        if (tabView != null) {
+                            // Get the favorite icon image view from the tab.
+                            val tabFavoriteIconImageView = tabView.findViewById<ImageView>(R.id.favorite_icon_imageview)
 
-        // Get the fragment view.
-        val webViewFragmentView = webViewTabFragment.view
+                            // Display the favorite icon in the tab.
+                            tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true))
+                        }
+                    }
+                }
+            }
 
-        // Set the current WebView if the fragment view is not null.
-        if (webViewFragmentView != null) {  // The fragment has been populated.
-            // Store the current WebView.
-            currentWebView = webViewFragmentView.findViewById(R.id.nestedscroll_webview)
+            // Save a copy of the title when it changes.
+            override fun onReceivedTitle(view: WebView, title: String) {
+                // Get the current page position.
+                val currentPosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-            // Update the status of swipe to refresh.
-            if (currentWebView!!.swipeToRefresh) {  // Swipe to refresh is enabled.
-                // Enable the swipe refresh layout if the WebView is scrolled all the way to the top.  It is updated every time the scroll changes.
-                swipeRefreshLayout.isEnabled = (currentWebView!!.scrollY == 0)
-            } else {  // Swipe to refresh is disabled.
-                // Disable the swipe refresh layout.
-                swipeRefreshLayout.isEnabled = false
-            }
+                // Get the current tab.
+                val tab = tabLayout.getTabAt(currentPosition)
 
-            // Set the cookie status.
-            cookieManager.setAcceptCookie(currentWebView!!.acceptCookies)
+                // Only populate the title text view if the tab has been fully created.
+                if (tab != null) {
+                    // Get the custom view from the tab.
+                    val tabView = tab.customView
 
-            // Update the privacy icons.  `true` redraws the icons in the app bar.
-            updatePrivacyIcons(true)
+                    // Only populate the title text view if the tab view has been fully populated.
+                    if (tabView != null) {
+                        // Get the title text view from the tab.
+                        val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
 
-            // Get a handle for the input method manager.
-            val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
+                        // Set the title according to the URL.
+                        if (title == "about:blank") {
+                            // Set the title to indicate a new tab.
+                            tabTitleTextView.setText(R.string.new_tab)
+                        } else {
+                            // Set the title as the tab text.
+                            tabTitleTextView.text = title
+                        }
+                    }
+                }
+            }
 
-            // Get the current URL.
-            val urlString = currentWebView!!.url
+            // Enter full screen video.
+            override fun onShowCustomView(video: View, callback: CustomViewCallback) {
+                // Set the full screen video flag.
+                displayingFullScreenVideo = true
 
-            // Update the URL edit text if not loading a new intent.  Otherwise, this will be handled by `onPageStarted()` (if called) and `onPageFinished()`.
-            if (!loadingNewIntent) {  // A new intent is not being loaded.
-                if ((urlString == null) || (urlString == "about:blank")) {  // The WebView is blank.
-                    // Display the hint in the URL edit text.
-                    urlEditText.setText("")
+                // Hide the keyboard.
+                inputMethodManager.hideSoftInputFromWindow(nestedScrollWebView.windowToken, 0)
 
-                    // Request focus for the URL text box.
-                    urlEditText.requestFocus()
+                // Hide the coordinator layout.
+                coordinatorLayout.visibility = View.GONE
 
-                    // Display the keyboard.
-                    inputMethodManager.showSoftInput(urlEditText, 0)
-                } else {  // The WebView has a loaded URL.
-                    // Clear the focus from the URL text box.
-                    urlEditText.clearFocus()
+                /* Hide the system bars.
+                 * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+                 * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+                 * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+                 * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+                 */
 
-                    // Hide the soft keyboard.
-                    inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
+                // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
+                @Suppress("DEPRECATION")
+                rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
 
-                    // Display the current URL in the URL text box.
-                    urlEditText.setText(urlString)
+                // Disable the sliding drawers.
+                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
 
-                    // Highlight the URL syntax.
-                    UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
-                }
-            } else {  // A new intent is being loaded.
-                // Reset the loading new intent flag.
-                loadingNewIntent = false
-            }
+                // Add the video view to the full screen video frame layout.
+                fullScreenVideoFrameLayout.addView(video)
 
-            // Set the background to indicate the domain settings status.
-            if (currentWebView!!.domainSettingsApplied) {
-                // Set a background on the URL relative layout to indicate that custom domain settings are being used.
-                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.drawable.domain_settings_url_background)
-            } else {
-                // Remove any background on the URL relative layout.
-                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.color.transparent)
-            }
-        } else if (pageNumber == savedTabPosition) {  // The app is being restored but the saved tab position fragment has not been populated yet.  Try again in 100 milliseconds.
-            // Create a handler to set the current WebView.
-            val setCurrentWebViewHandler = Handler(Looper.getMainLooper())
+                // Show the full screen video frame layout.
+                fullScreenVideoFrameLayout.visibility = View.VISIBLE
 
-            // Create a runnable to set the current WebView.
-            val setCurrentWebWebRunnable = Runnable {
-                // Set the current WebView.
-                setCurrentWebView(pageNumber)
+                // Disable the screen timeout while the video is playing.  YouTube does this automatically, but not all other videos do.
+                fullScreenVideoFrameLayout.keepScreenOn = true
             }
 
-            // Try setting the current WebView again after 100 milliseconds.
-            setCurrentWebViewHandler.postDelayed(setCurrentWebWebRunnable, 100)
-        }
-    }
+            // Exit full screen video.
+            override fun onHideCustomView() {
+                // Exit the full screen video.
+                exitFullScreenVideo()
+            }
 
-    @SuppressLint("ClickableViewAccessibility")
-    override fun initializeWebView(nestedScrollWebView: NestedScrollWebView, pageNumber: Int, progressBar: ProgressBar, urlString: String, restoringState: Boolean) {
-        // Get the WebView theme.
-        val webViewTheme = sharedPreferences.getString(getString(R.string.webview_theme_key), getString(R.string.webview_theme_default_value))
+            // Upload files.
+            override fun onShowFileChooser(webView: WebView, filePathCallback: ValueCallback<Array<Uri>>, fileChooserParams: FileChooserParams): Boolean {
+                // Store the file path callback.
+                fileChooserCallback = filePathCallback
 
-        // Get the WebView theme entry values string array.
-        val webViewThemeEntryValuesStringArray = resources.getStringArray(R.array.webview_theme_entry_values)
+                // Create an intent to open a chooser based on the file chooser parameters.
+                val fileChooserIntent = fileChooserParams.createIntent()
 
-        // Set the WebView theme if device is running API >= 29 and algorithmic darkening is supported.
-        if (Build.VERSION.SDK_INT >= 29 && WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
-            // Set the WebView them.  A switch statement cannot be used because the WebView theme entry values string array is not a compile time constant.
-            if (webViewTheme == webViewThemeEntryValuesStringArray[1]) {  // The light theme is selected.
-                // Turn off algorithmic darkening.
-                WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
+                // Check to see if the file chooser intent resolves to an installed package.
+                if (fileChooserIntent.resolveActivity(packageManager) != null) {  // The file chooser intent is fine.
+                    // Launch the file chooser intent.
+                    browseFileUploadActivityResultLauncher.launch(fileChooserIntent)
+                } else {  // The file chooser intent will cause a crash.
+                    // Create a generic intent to open a chooser.
+                    val genericFileChooserIntent = Intent(Intent.ACTION_GET_CONTENT)
 
-                // Make the WebView visible. The WebView was created invisible in `webview_framelayout` to prevent a white background splash in night mode.
-                // If the system is currently in night mode, showing the WebView will be handled in `onProgressChanged()`.
-                nestedScrollWebView.visibility = View.VISIBLE
-            } else if (webViewTheme == webViewThemeEntryValuesStringArray[2]) {  // The dark theme is selected.
-                // Turn on algorithmic darkening.
-                WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
-            } else {  // The system default theme is selected.
-                // Get the current theme status.
-                val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
+                    // Request an openable file.
+                    genericFileChooserIntent.addCategory(Intent.CATEGORY_OPENABLE)
 
-                // Set the algorithmic darkening according to the current system theme status.
-                if (currentThemeStatus == Configuration.UI_MODE_NIGHT_NO) {  // The system is in day mode.
-                    // Turn off algorithmic darkening.
-                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
+                    // Set the file type to everything.
+                    genericFileChooserIntent.type = "*/*"
 
-                    // Make the WebView visible. The WebView was created invisible in `webview_framelayout` to prevent a white background splash in night mode.
-                    // If the system is currently in night mode, showing the WebView will be handled in `onProgressChanged()`.
-                    nestedScrollWebView.visibility = View.VISIBLE
-                } else {  // The system is in night mode.
-                    // Turn on algorithmic darkening.
-                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+                    // Launch the generic file chooser intent.
+                    browseFileUploadActivityResultLauncher.launch(genericFileChooserIntent)
                 }
+
+                // Handle the event.
+                return true
             }
         }
+        nestedScrollWebView.webViewClient = object : WebViewClient() {
+            // `shouldOverrideUrlLoading` makes this WebView the default handler for URLs inside the app, so that links are not kicked out to other apps.
+            override fun shouldOverrideUrlLoading(view: WebView, webResourceRequest: WebResourceRequest): Boolean {
+                // Get the URL from the web resource request.
+                var requestUrlString = webResourceRequest.url.toString()
 
-        // Get a handle for the input method manager.
-        val inputMethodManager = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
+                // Sanitize the url.
+                requestUrlString = sanitizeUrl(requestUrlString)
 
-        // Instantiate the blocklist helper.  TODO.  Make a class instance.
-        val blocklistHelper = BlocklistHelper()
+                // Handle the URL according to the type.
+                return if (requestUrlString.startsWith("http")) {  // Load the URL in Privacy Browser.
+                    // Load the URL.  By using `loadUrl()`, instead of `loadUrlFromBase()`, the Referer header will never be sent.
+                    loadUrl(nestedScrollWebView, requestUrlString)
 
-        // Set the app bar scrolling.
-        nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
+                    // Returning true indicates that Privacy Browser is manually handling the loading of the URL.
+                    // Custom headers cannot be added if false is returned and the WebView handles the loading of the URL.
+                    true
+                } else if (requestUrlString.startsWith("mailto:")) {  // Load the email address in an external email program.
+                    // Use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
+                    val emailIntent = Intent(Intent.ACTION_SENDTO)
 
-        // Allow pinch to zoom.
-        nestedScrollWebView.settings.builtInZoomControls = true
+                    // Parse the url and set it as the data for the intent.
+                    emailIntent.data = Uri.parse(requestUrlString)
 
-        // Hide zoom controls.
-        nestedScrollWebView.settings.displayZoomControls = false
+                    // Open the email program in a new task instead of as part of Privacy Browser.
+                    emailIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-        // Don't allow mixed content (HTTP and HTTPS) on the same website.
-        nestedScrollWebView.settings.mixedContentMode = WebSettings.MIXED_CONTENT_NEVER_ALLOW
+                    try {
+                        // Make it so.
+                        startActivity(emailIntent)
+                    } catch (exception: ActivityNotFoundException) {
+                        // Display a snackbar.
+                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                    }
 
-        // Set the WebView to load in overview mode (zoomed out to the maximum width).
-        nestedScrollWebView.settings.loadWithOverviewMode = true
+                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
+                    true
+                } else if (requestUrlString.startsWith("tel:")) {  // Load the phone number in the dialer.
+                    // Create a dial intent.
+                    val dialIntent = Intent(Intent.ACTION_DIAL)
 
-        // Explicitly disable geolocation.
-        nestedScrollWebView.settings.setGeolocationEnabled(false)
+                    // Add the phone number to the intent.
+                    dialIntent.data = Uri.parse(requestUrlString)
 
-        // Allow loading of file:// URLs.  This is necessary for opening MHT web archives, which are copied into a temporary cache location.
-        nestedScrollWebView.settings.allowFileAccess = true
+                    // Open the dialer in a new task instead of as part of Privacy Browser.
+                    dialIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-        // Create a double-tap gesture detector to toggle full-screen mode.
-        val doubleTapGestureDetector = GestureDetector(this, object : GestureDetector.SimpleOnGestureListener() {
-            // Override `onDoubleTap()`.  All other events are handled using the default settings.
-            override fun onDoubleTap(motionEvent: MotionEvent): Boolean {
-                return if (fullScreenBrowsingModeEnabled) {  // Only process the double-tap if full screen browsing mode is enabled.
-                    // Toggle the full screen browsing mode tracker.
-                    inFullScreenBrowsingMode = !inFullScreenBrowsingMode
+                    try {
+                        // Make it so.
+                        startActivity(dialIntent)
+                    } catch (exception: ActivityNotFoundException) {
+                        // Display a snackbar.
+                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                    }
 
-                    // Toggle the full screen browsing mode.
-                    if (inFullScreenBrowsingMode) {  // Switch to full screen mode.
-                        // Hide the app bar if specified.
-                        if (hideAppBar) {  // App bar hiding is enabled.
-                            // Close the find on page bar if it is visible.
-                            closeFindOnPage(null)
+                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
+                    true
+                } else {  // Load a system chooser to select an app that can handle the URL.
+                    // Create a generic intent to open an app.
+                    val genericIntent = Intent(Intent.ACTION_VIEW)
 
-                            // Hide the tab linear layout.
-                            tabsLinearLayout.visibility = View.GONE
+                    // Add the URL to the intent.
+                    genericIntent.data = Uri.parse(requestUrlString)
 
-                            // Hide the app bar.
-                            appBar.hide()
+                    // List all apps that can handle the URL instead of just opening the first one.
+                    genericIntent.addCategory(Intent.CATEGORY_BROWSABLE)
 
-                            // Set layout and scrolling parameters according to the position of the app bar.
-                            if (bottomAppBar) {  // The app bar is at the bottom.
-                                // Reset the WebView padding to fill the available space.
-                                swipeRefreshLayout.setPadding(0, 0, 0, 0)
-                            } else {  // The app bar is at the top.
-                                // Check to see if the app bar is normally scrolled.
-                                if (scrollAppBar) {  // The app bar is scrolled when it is displayed.
-                                    // Get the swipe refresh layout parameters.
-                                    val swipeRefreshLayoutParams = swipeRefreshLayout.layoutParams as CoordinatorLayout.LayoutParams
+                    // Open the app in a new task instead of as part of Privacy Browser.
+                    genericIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                                    // Remove the off-screen scrolling layout.
-                                    swipeRefreshLayoutParams.behavior = null
-                                } else {  // The app bar is not scrolled when it is displayed.
-                                    // Remove the padding from the top of the swipe refresh layout.
-                                    swipeRefreshLayout.setPadding(0, 0, 0, 0)
+                    try {
+                        // Make it so.
+                        startActivity(genericIntent)
+                    } catch (exception: ActivityNotFoundException) {
+                        // Display a snackbar.
+                        Snackbar.make(nestedScrollWebView, getString(R.string.unrecognized_url, requestUrlString), Snackbar.LENGTH_SHORT).show()
+                    }
 
-                                    // The swipe refresh circle must be moved above the now removed status bar location.
-                                    swipeRefreshLayout.setProgressViewOffset(false, -200, defaultProgressViewEndOffset)
-                                }
-                            }
-                        } else {  // App bar hiding is not enabled.
-                            // Adjust the UI for the bottom app bar.
-                            if (bottomAppBar) {
-                                // Adjust the UI according to the scrolling of the app bar.
-                                if (scrollAppBar) {
-                                    // Reset the WebView padding to fill the available space.
-                                    swipeRefreshLayout.setPadding(0, 0, 0, 0)
-                                } else {
-                                    // Move the WebView above the app bar layout.
-                                    swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
-                                }
-                            }
-                        }
+                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
+                    true
+                }
+            }
 
-                        /* Hide the system bars.
-                         * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-                         * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
-                         * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-                         * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-                         */
+            // Check requests against the block lists.
+            override fun shouldInterceptRequest(view: WebView, webResourceRequest: WebResourceRequest): WebResourceResponse? {
+                // Get the URL.
+                val requestUrlString = webResourceRequest.url.toString()
 
-                        // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-                        @Suppress("DEPRECATION")
-                        rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or
-                                View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
-                    } else {  // Switch to normal viewing mode.
-                        // Show the app bar if it was hidden.
-                        if (hideAppBar) {
-                            // Show the tab linear layout.
-                            tabsLinearLayout.visibility = View.VISIBLE
+                // Check to see if the resource request is for the main URL.
+                if (requestUrlString == nestedScrollWebView.currentUrl) {
+                    // `return null` loads the resource request, which should never be blocked if it is the main URL.
+                    return null
+                }
 
-                            // Show the app bar.
-                            appBar.show()
-                        }
+                // Wait until the filter lists have been populated.  When Privacy Browser is being resumed after having the process killed in the background it will try to load the URLs immediately.
+                while (ultraPrivacy == null) {
+                    try {
+                        // Check to see if the filter lists have been populated after 100 ms.
+                        Thread.sleep(100)
+                    } catch (exception: InterruptedException) {
+                        // Do nothing.
+                    }
+                }
 
-                        // Set layout and scrolling parameters according to the position of the app bar.
-                        if (bottomAppBar) {  // The app bar is at the bottom.
-                            // Adjust the UI.
-                            if (scrollAppBar) {
-                                // Reset the WebView padding to fill the available space.
-                                swipeRefreshLayout.setPadding(0, 0, 0, 0)
-                            } else {
-                                // Move the WebView above the app bar layout.
-                                swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
-                            }
-                        } else {  // The app bar is at the top.
-                            // Check to see if the app bar is normally scrolled.
-                            if (scrollAppBar) {  // The app bar is scrolled when it is displayed.
-                                // Get the swipe refresh layout parameters.
-                                val swipeRefreshLayoutParams = swipeRefreshLayout.layoutParams as CoordinatorLayout.LayoutParams
+                // Create an empty web resource response to be used if the resource request is blocked.
+                val emptyWebResourceResponse = WebResourceResponse("text/plain", "utf8", ByteArrayInputStream("".toByteArray()))
 
-                                // Add the off-screen scrolling layout.
-                                swipeRefreshLayoutParams.behavior = AppBarLayout.ScrollingViewBehavior()
-                            } else {  // The app bar is not scrolled when it is displayed.
-                                // The swipe refresh layout must be manually moved below the app bar layout.
-                                swipeRefreshLayout.setPadding(0, appBarHeight, 0, 0)
+                // Initialize the variables.
+                var allowListResultStringArray: Array<String>? = null
+                var isThirdPartyRequest = false
 
-                                // The swipe to refresh circle doesn't always hide itself completely unless it is moved up 10 pixels.
-                                swipeRefreshLayout.setProgressViewOffset(false, defaultProgressViewStartOffset - 10 + appBarHeight, defaultProgressViewEndOffset + appBarHeight)
-                            }
-                        }
+                // Get the current URL.  `.getUrl()` throws an error because operations on the WebView cannot be made from this thread.
+                var currentBaseDomain = nestedScrollWebView.currentDomainName
+
+                // Store a copy of the current domain for use in later requests.
+                val currentDomain = currentBaseDomain
+
+                // Get the request host name.
+                var requestBaseDomain = webResourceRequest.url.host
 
-                        // Remove the `SYSTEM_UI` flags from the root frame layout.  The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-                        @Suppress("DEPRECATION")
-                        rootFrameLayout.systemUiVisibility = 0
+                // Only check for third-party requests if the current base domain is not empty and the request domain is not null.
+                if (currentBaseDomain.isNotEmpty() && (requestBaseDomain != null)) {
+                    // Determine the current base domain.
+                    while (currentBaseDomain.indexOf(".", currentBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
+                        // Remove the first subdomain.
+                        currentBaseDomain = currentBaseDomain.substring(currentBaseDomain.indexOf(".") + 1)
                     }
 
-                    // Consume the double-tap.
-                    true
-                } else { // Do not consume the double-tap because full screen browsing mode is disabled.
-                    // Return false.
-                    false
+                    // Determine the request base domain.
+                    while (requestBaseDomain!!.indexOf(".", requestBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
+                        // Remove the first subdomain.
+                        requestBaseDomain = requestBaseDomain.substring(requestBaseDomain.indexOf(".") + 1)
+                    }
+
+                    // Update the third party request tracker.
+                    isThirdPartyRequest = currentBaseDomain != requestBaseDomain
                 }
-            }
 
-            override fun onFling(motionEvent1: MotionEvent, motionEvent2: MotionEvent, velocityX: Float, velocityY: Float): Boolean {
-                // Scroll the bottom app bar if enabled.
-                if (bottomAppBar && scrollAppBar && !objectAnimator.isRunning) {
-                    // Calculate the Y change.
-                    val motionY = motionEvent2.y - motionEvent1.y
+                // Get the current WebView page position.
+                val webViewPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-                    // Scroll the app bar if the change is greater than 50 pixels.
-                    if (motionY > 50) {
-                        // Animate the bottom app bar onto the screen.
-                        objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", 0f)
-                    } else if (motionY < -50) {
-                        // Animate the bottom app bar off the screen.
-                        objectAnimator = ObjectAnimator.ofFloat(appBarLayout, "translationY", appBarLayout.height.toFloat())
+                // Determine if the WebView is currently displayed.
+                val webViewDisplayed = (webViewPagePosition == tabLayout.selectedTabPosition)
+
+                // Block third-party requests if enabled.
+                if (isThirdPartyRequest && nestedScrollWebView.blockAllThirdPartyRequests) {
+                    // Add the result to the resource requests.
+                    nestedScrollWebView.addResourceRequest(arrayOf(REQUEST_THIRD_PARTY, requestUrlString))
+
+                    // Increment the blocked requests counters.
+                    nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                    nestedScrollWebView.incrementRequestsCount(THIRD_PARTY_REQUESTS)
+
+                    // Update the titles of the filter lists menu items if the WebView is currently displayed.
+                    if (webViewDisplayed) {
+                        // Updating the UI must be run from the UI thread.
+                        runOnUiThread {
+                            // Update the menu item titles.
+                            navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+
+                            // Update the options menu if it has been populated.
+                            if (optionsMenu != null) {
+                                optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                                optionsBlockAllThirdPartyRequestsMenuItem.title =
+                                    nestedScrollWebView.getRequestsCount(THIRD_PARTY_REQUESTS).toString() + " - " + getString(R.string.block_all_third_party_requests)
+                            }
+                        }
                     }
 
-                    // Make it so.
-                    objectAnimator.start()
+                    // The resource request was blocked.  Return an empty web resource response.
+                    return emptyWebResourceResponse
                 }
 
-                // Do not consume the event.
-                return false
-            }
-        })
+                // Check UltraList if it is enabled.
+                if (nestedScrollWebView.ultraListEnabled) {
+                    // Check the URL against UltraList.
+                    val ultraListResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, ultraList)
 
-        // Pass all touch events on the WebView through the double-tap gesture detector.
-        nestedScrollWebView.setOnTouchListener { view: View, motionEvent: MotionEvent? ->
-            // Call `performClick()` on the view, which is required for accessibility.
-            view.performClick()
+                    // Process the UltraList results.
+                    if (ultraListResults[0] == REQUEST_BLOCKED) {  // The resource request matched UltraList's block list.
+                        // Add the result to the resource requests.
+                        nestedScrollWebView.addResourceRequest(arrayOf(ultraListResults[0], ultraListResults[1], ultraListResults[2], ultraListResults[3], ultraListResults[4], ultraListResults[5]))
 
-            // Check for double-taps.
-            doubleTapGestureDetector.onTouchEvent(motionEvent!!)
-        }
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(com.stoutner.privacybrowser.views.ULTRALIST)
 
-        // Register the WebView for a context menu.  This is used to see link targets and download images.
-        registerForContextMenu(nestedScrollWebView)
+                        // Update the titles of the filter lists menu items if the WebView is currently displayed.
+                        if (webViewDisplayed) {
+                            // Updating the UI must be run from the UI thread.
+                            runOnUiThread {
+                                // Update the menu item titles.
+                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
 
-        // Allow the downloading of files.
-        nestedScrollWebView.setDownloadListener { downloadUrlString: String?, userAgent: String?, contentDisposition: String?, mimetype: String?, contentLength: Long ->
-            // Check the download preference.
-            if (downloadWithExternalApp) {  // Download with an external app.
-                downloadUrlWithExternalApp(downloadUrlString!!)
-            } else {  // Handle the download inside of Privacy Browser.
-                // Define a formatted file size string.
+                                // Update the options menu if it has been populated.
+                                if (optionsMenu != null) {
+                                    optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                                    optionsUltraListMenuItem.title = nestedScrollWebView.getRequestsCount(com.stoutner.privacybrowser.views.ULTRALIST).toString() + " - " + getString(R.string.ultralist)
+                                }
+                            }
+                        }
 
-                // Process the content length if it contains data.
-                val formattedFileSizeString = if (contentLength > 0) {  // The content length is greater than 0.
-                    // Format the content length as a string.
-                    NumberFormat.getInstance().format(contentLength) + " " + getString(R.string.bytes)
-                } else {  // The content length is not greater than 0.
-                    // Set the formatted file size string to be `unknown size`.
-                    getString(R.string.unknown_size)
+                        // The resource request was blocked.  Return an empty web resource response.
+                        return emptyWebResourceResponse
+                    } else if (ultraListResults[0] == REQUEST_ALLOWED) {  // The resource request matched UltraList's allow list.
+                        // Add an allow list entry to the resource requests array.
+                        nestedScrollWebView.addResourceRequest(arrayOf(ultraListResults[0], ultraListResults[1], ultraListResults[2], ultraListResults[3], ultraListResults[4], ultraListResults[5]))
+
+                        // The resource request has been allowed by UltraList.  `return null` loads the requested resource.
+                        return null
+                    }
                 }
 
-                // Get the file name from the content disposition.
-                val fileNameString = UrlHelper.getFileName(this, contentDisposition, mimetype, downloadUrlString!!)
+                // Check UltraPrivacy if it is enabled.
+                if (nestedScrollWebView.ultraPrivacyEnabled) {
+                    // Check the URL against UltraPrivacy.
+                    val ultraPrivacyResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, ultraPrivacy!!)
 
-                // Instantiate the save dialog.
-                val saveDialogFragment = SaveDialog.saveUrl(downloadUrlString, fileNameString, formattedFileSizeString, userAgent!!, nestedScrollWebView.acceptCookies)
+                    // Process the UltraPrivacy results.
+                    if (ultraPrivacyResults[0] == REQUEST_BLOCKED) {  // The resource request matched UltraPrivacy's block list.
+                        // Add the result to the resource requests.
+                        nestedScrollWebView.addResourceRequest(arrayOf(ultraPrivacyResults[0], ultraPrivacyResults[1], ultraPrivacyResults[2], ultraPrivacyResults[3], ultraPrivacyResults[4],
+                            ultraPrivacyResults[5]))
 
-                // Try to show the dialog.  The download listener continues to function even when the WebView is paused.  Attempting to display a dialog in that state leads to a crash.
-                try {
-                    // Show the save dialog.
-                    saveDialogFragment.show(supportFragmentManager, getString(R.string.save_dialog))
-                } catch (exception: Exception) {  // The dialog could not be shown.
-                    // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
-                    pendingDialogsArrayList.add(PendingDialogDataClass(saveDialogFragment, getString(R.string.save_dialog)))
-                }
-            }
-        }
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(ULTRAPRIVACY)
 
-        // Update the find on page count.
-        nestedScrollWebView.setFindListener { activeMatchOrdinal, numberOfMatches, isDoneCounting ->
-            if (isDoneCounting && (numberOfMatches == 0)) {  // There are no matches.
-                // Set the find on page count text view to be `0/0`.
-                findOnPageCountTextView.setText(R.string.zero_of_zero)
-            } else if (isDoneCounting) {  // There are matches.
-                // The active match ordinal is zero-based.
-                val activeMatch = activeMatchOrdinal + 1
+                        // Update the titles of the filter lists menu items if the WebView is currently displayed.
+                        if (webViewDisplayed) {
+                            // Updating the UI must be run from the UI thread.
+                            runOnUiThread {
+                                // Update the menu item titles.
+                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
 
-                // Build the match string.
-                val matchString = "$activeMatch/$numberOfMatches"
+                                // Update the options menu if it has been populated.
+                                if (optionsMenu != null) {
+                                    optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                                    optionsUltraPrivacyMenuItem.title = nestedScrollWebView.getRequestsCount(ULTRAPRIVACY).toString() + " - " + getString(R.string.ultraprivacy)
+                                }
+                            }
+                        }
 
-                // Update the find on page count text view.
-                findOnPageCountTextView.text = matchString
-            }
-        }
+                        // The resource request was blocked.  Return an empty web resource response.
+                        return emptyWebResourceResponse
+                    } else if (ultraPrivacyResults[0] == REQUEST_ALLOWED) {  // The resource request matched UltraPrivacy's allow list.
+                        // Add an allow list entry to the resource requests array.
+                        nestedScrollWebView.addResourceRequest(arrayOf(ultraPrivacyResults[0], ultraPrivacyResults[1], ultraPrivacyResults[2], ultraPrivacyResults[3], ultraPrivacyResults[4],
+                            ultraPrivacyResults[5]))
 
-        // Process scroll changes.
-        nestedScrollWebView.setOnScrollChangeListener { _: View?, _: Int, _: Int, _: Int, _: Int ->
-            // Set the swipe to refresh status.
-            if (nestedScrollWebView.swipeToRefresh)  // Only enable swipe to refresh if the WebView is scrolled to the top.
-                swipeRefreshLayout.isEnabled = nestedScrollWebView.scrollY == 0
-            else  // Disable swipe to refresh.
-                swipeRefreshLayout.isEnabled = false
+                        // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
+                        return null
+                    }
+                }
 
-            // Reinforce the system UI visibility flags if in full screen browsing mode.
-            // This hides the status and navigation bars, which are displayed if other elements are shown, like dialog boxes, the options menu, or the keyboard.
-            if (inFullScreenBrowsingMode) {
-                /* Hide the system bars.
-                 * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-                 * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
-                 * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-                 * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-                 */
+                // Check EasyList if it is enabled.
+                if (nestedScrollWebView.easyListEnabled) {
+                    // Check the URL against EasyList.
+                    val easyListResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, easyList)
 
-                // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-                @Suppress("DEPRECATION")
-                rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
-            }
-        }
+                    // Process the EasyList results.
+                    if (easyListResults[0] == REQUEST_BLOCKED) {  // The resource request matched EasyList's block list.
+                        // Add the result to the resource requests.
+                        nestedScrollWebView.addResourceRequest(arrayOf(easyListResults[0], easyListResults[1], easyListResults[2], easyListResults[3], easyListResults[4], easyListResults[5]))
 
-        // Set the web chrome client.
-        nestedScrollWebView.webChromeClient = object : WebChromeClient() {
-            // Update the progress bar when a page is loading.
-            override fun onProgressChanged(view: WebView, progress: Int) {
-                // Update the progress bar.
-                progressBar.progress = progress
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(EASYLIST)
 
-                // Set the visibility of the progress bar.
-                if (progress < 100) {
-                    // Show the progress bar.
-                    progressBar.visibility = View.VISIBLE
-                } else {
-                    // Hide the progress bar.
-                    progressBar.visibility = View.GONE
+                        // Update the titles of the filter lists menu items if the WebView is currently displayed.
+                        if (webViewDisplayed) {
+                            // Updating the UI must be run from the UI thread.
+                            runOnUiThread {
+                                // Update the menu item titles.
+                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
 
-                    //Stop the swipe to refresh indicator if it is running
-                    swipeRefreshLayout.isRefreshing = false
+                                // Update the options menu if it has been populated.
+                                if (optionsMenu != null) {
+                                    optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                                    optionsEasyListMenuItem.title = nestedScrollWebView.getRequestsCount(EASYLIST).toString() + " - " + getString(R.string.easylist)
+                                }
+                            }
+                        }
 
-                    // Make the current WebView visible.  If this is a new tab, the current WebView would have been created invisible in `webview_framelayout` to prevent a white background splash in night mode.
-                    nestedScrollWebView.visibility = View.VISIBLE
+                        // The resource request was blocked.  Return an empty web resource response.
+                        return emptyWebResourceResponse
+                    } else if (easyListResults[0] == REQUEST_ALLOWED) {  // The resource request matched EasyList's allow list.
+                        // Update the allow list result string array tracker.
+                        allowListResultStringArray = arrayOf(easyListResults[0], easyListResults[1], easyListResults[2], easyListResults[3], easyListResults[4], easyListResults[5])
+                    }
                 }
-            }
-
-            // Set the favorite icon when it changes.
-            override fun onReceivedIcon(view: WebView, icon: Bitmap) {
-                // Only update the favorite icon if the website has finished loading and the new favorite icon height is greater than the current favorite icon height.
-                // This prevents low resolution icons from replacing high resolution one.
-                // The check for the visibility of the progress bar can possibly be removed once https://redmine.stoutner.com/issues/747 is fixed.
-                if ((progressBar.visibility == View.GONE) && (icon.height > nestedScrollWebView.getFavoriteIconHeight())) {
-                    // Store the new favorite icon.
-                    nestedScrollWebView.setFavoriteIcon(icon)
 
-                    // Get the current page position.
-                    val currentPosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+                // Check EasyPrivacy if it is enabled.
+                if (nestedScrollWebView.easyPrivacyEnabled) {
+                    // Check the URL against EasyPrivacy.
+                    val easyPrivacyResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, easyPrivacy)
 
-                    // Get the current tab.
-                    val tab = tabLayout.getTabAt(currentPosition)
+                    // Process the EasyPrivacy results.
+                    if (easyPrivacyResults[0] == REQUEST_BLOCKED) {  // The resource request matched EasyPrivacy's block list.
+                        // Add the result to the resource requests.
+                        nestedScrollWebView.addResourceRequest(arrayOf(easyPrivacyResults[0], easyPrivacyResults[1], easyPrivacyResults[2], easyPrivacyResults[3], easyPrivacyResults[4], easyPrivacyResults[5]))
 
-                    // Check to see if the tab has been populated.
-                    if (tab != null) {
-                        // Get the custom view from the tab.
-                        val tabView = tab.customView
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(EASYPRIVACY)
 
-                        // Check to see if the custom tab view has been populated.
-                        if (tabView != null) {
-                            // Get the favorite icon image view from the tab.
-                            val tabFavoriteIconImageView = tabView.findViewById<ImageView>(R.id.favorite_icon_imageview)
+                        // Update the titles of the filter lists menu items if the WebView is currently displayed.
+                        if (webViewDisplayed) {
+                            // Updating the UI must be run from the UI thread.
+                            runOnUiThread {
+                                // Update the menu item titles.
+                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
 
-                            // Display the favorite icon in the tab.
-                            tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true))
+                                // Update the options menu if it has been populated.
+                                if (optionsMenu != null) {
+                                    optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                                    optionsEasyPrivacyMenuItem.title = nestedScrollWebView.getRequestsCount(EASYPRIVACY).toString() + " - " + getString(R.string.easyprivacy)
+                                }
+                            }
                         }
+
+                        // The resource request was blocked.  Return an empty web resource response.
+                        return emptyWebResourceResponse
+                    } else if (easyPrivacyResults[0] == REQUEST_ALLOWED) {  // The resource request matched EasyPrivacy's allow list.
+                        // Update the allow list result string array tracker.
+                        allowListResultStringArray = arrayOf(easyPrivacyResults[0], easyPrivacyResults[1], easyPrivacyResults[2], easyPrivacyResults[3], easyPrivacyResults[4], easyPrivacyResults[5])
                     }
                 }
-            }
 
-            // Save a copy of the title when it changes.
-            override fun onReceivedTitle(view: WebView, title: String) {
-                // Get the current page position.
-                val currentPosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+                // Check Fanboy’s Annoyance List if it is enabled.
+                if (nestedScrollWebView.fanboysAnnoyanceListEnabled) {
+                    // Check the URL against Fanboy's Annoyance List.
+                    val fanboysAnnoyanceListResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, fanboysAnnoyanceList)
 
-                // Get the current tab.
-                val tab = tabLayout.getTabAt(currentPosition)
+                    // Process the Fanboy's Annoyance List results.
+                    if (fanboysAnnoyanceListResults[0] == REQUEST_BLOCKED) {  // The resource request matched Fanboy's Annoyance List's block list.
+                        // Add the result to the resource requests.
+                        nestedScrollWebView.addResourceRequest(arrayOf(fanboysAnnoyanceListResults[0], fanboysAnnoyanceListResults[1], fanboysAnnoyanceListResults[2], fanboysAnnoyanceListResults[3],
+                            fanboysAnnoyanceListResults[4], fanboysAnnoyanceListResults[5]))
 
-                // Only populate the title text view if the tab has been fully created.
-                if (tab != null) {
-                    // Get the custom view from the tab.
-                    val tabView = tab.customView
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(FANBOYS_ANNOYANCE_LIST)
 
-                    // Only populate the title text view if the tab view has been fully populated.
-                    if (tabView != null) {
-                        // Get the title text view from the tab.
-                        val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
+                        // Update the titles of the filter lists menu items if the WebView is currently displayed.
+                        if (webViewDisplayed) {
+                            // Updating the UI must be run from the UI thread.
+                            runOnUiThread {
+                                // Update the menu item titles.
+                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
 
-                        // Set the title according to the URL.
-                        if (title == "about:blank") {
-                            // Set the title to indicate a new tab.
-                            tabTitleTextView.setText(R.string.new_tab)
-                        } else {
-                            // Set the title as the tab text.
-                            tabTitleTextView.text = title
+                                // Update the options menu if it has been populated.
+                                if (optionsMenu != null) {
+                                    optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                                    optionsFanboysAnnoyanceListMenuItem.title = nestedScrollWebView.getRequestsCount(FANBOYS_ANNOYANCE_LIST).toString() + " - " + getString(R.string.fanboys_annoyance_list)
+                                }
+                            }
                         }
+
+                        // The resource request was blocked.  Return an empty web resource response.
+                        return emptyWebResourceResponse
+                    } else if (fanboysAnnoyanceListResults[0] == REQUEST_ALLOWED) {  // The resource request matched Fanboy's Annoyance List's allow list.
+                        // Update the allow list result string array tracker.
+                        allowListResultStringArray = arrayOf(fanboysAnnoyanceListResults[0], fanboysAnnoyanceListResults[1], fanboysAnnoyanceListResults[2], fanboysAnnoyanceListResults[3],
+                            fanboysAnnoyanceListResults[4], fanboysAnnoyanceListResults[5])
                     }
-                }
-            }
+                } else if (nestedScrollWebView.fanboysSocialBlockingListEnabled) {  // Only check Fanboy’s Social Blocking List if Fanboy’s Annoyance List is disabled.
+                    // Check the URL against Fanboy's Annoyance List.
+                    val fanboysSocialListResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, fanboysSocialList)
 
-            // Enter full screen video.
-            override fun onShowCustomView(video: View, callback: CustomViewCallback) {
-                // Set the full screen video flag.
-                displayingFullScreenVideo = true
+                    // Process the Fanboy's Social Blocking List results.
+                    if (fanboysSocialListResults[0] == REQUEST_BLOCKED) {  // The resource request matched Fanboy's Social Blocking List's block list.
+                        // Add the result to the resource requests.
+                        nestedScrollWebView.addResourceRequest(arrayOf(fanboysSocialListResults[0], fanboysSocialListResults[1], fanboysSocialListResults[2], fanboysSocialListResults[3],
+                            fanboysSocialListResults[4], fanboysSocialListResults[5]))
 
-                // Hide the keyboard.
-                inputMethodManager.hideSoftInputFromWindow(nestedScrollWebView.windowToken, 0)
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(FANBOYS_SOCIAL_BLOCKING_LIST)
 
-                // Hide the coordinator layout.
-                coordinatorLayout.visibility = View.GONE
+                        // Update the titles of the filter lists menu items if the WebView is currently displayed.
+                        if (webViewDisplayed) {
+                            // Updating the UI must be run from the UI thread.
+                            runOnUiThread {
+                                // Update the menu item titles.
+                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
 
-                /* Hide the system bars.
-                 * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-                 * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
-                 * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-                 * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-                 */
+                                // Update the options menu if it has been populated.
+                                if (optionsMenu != null) {
+                                    optionsFilterListsMenuItem.title = getString(R.string.filterlists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                                    optionsFanboysSocialBlockingListMenuItem.title =
+                                        nestedScrollWebView.getRequestsCount(FANBOYS_SOCIAL_BLOCKING_LIST).toString() + " - " + getString(R.string.fanboys_social_blocking_list)
+                                }
+                            }
+                        }
 
-                // The deprecated command can be switched to `WindowInsetsController` once the minimum API >= 30.
-                @Suppress("DEPRECATION")
-                rootFrameLayout.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+                        // The resource request was blocked.  Return an empty web resource response.
+                        return emptyWebResourceResponse
+                    } else if (fanboysSocialListResults[0] == REQUEST_ALLOWED) {  // The resource request matched Fanboy's Social Blocking List's allow list.
+                        // Update the allow list result string array tracker.
+                        allowListResultStringArray = arrayOf(fanboysSocialListResults[0], fanboysSocialListResults[1], fanboysSocialListResults[2], fanboysSocialListResults[3], fanboysSocialListResults[4],
+                            fanboysSocialListResults[5])
+                    }
+                }
 
-                // Disable the sliding drawers.
-                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
+                // Add the request to the log because it hasn't been processed by any of the previous checks.
+                if (allowListResultStringArray != null) {  // The request was processed by an allow list.
+                    nestedScrollWebView.addResourceRequest(allowListResultStringArray)
+                } else {  // The request didn't match any filter list entry.  Log it as a default request.
+                    nestedScrollWebView.addResourceRequest(arrayOf(REQUEST_DEFAULT, requestUrlString))
+                }
 
-                // Add the video view to the full screen video frame layout.
-                fullScreenVideoFrameLayout.addView(video)
+                // The resource request has not been blocked.  `return null` loads the requested resource.
+                return null
+            }
 
-                // Show the full screen video frame layout.
-                fullScreenVideoFrameLayout.visibility = View.VISIBLE
+            // Handle HTTP authentication requests.
+            override fun onReceivedHttpAuthRequest(view: WebView, handler: HttpAuthHandler, host: String, realm: String) {
+                // Store the handler.
+                nestedScrollWebView.httpAuthHandler = handler
 
-                // Disable the screen timeout while the video is playing.  YouTube does this automatically, but not all other videos do.
-                fullScreenVideoFrameLayout.keepScreenOn = true
-            }
+                // Instantiate an HTTP authentication dialog.
+                val httpAuthenticationDialogFragment = HttpAuthenticationDialog.displayDialog(host, realm, nestedScrollWebView.webViewFragmentId)
 
-            // Exit full screen video.
-            override fun onHideCustomView() {
-                // Exit the full screen video.
-                exitFullScreenVideo()
+                // Show the HTTP authentication dialog.
+                httpAuthenticationDialogFragment.show(supportFragmentManager, getString(R.string.http_authentication))
             }
 
-            // Upload files.
-            override fun onShowFileChooser(webView: WebView, filePathCallback: ValueCallback<Array<Uri>>, fileChooserParams: FileChooserParams): Boolean {
-                // Store the file path callback.
-                fileChooserCallback = filePathCallback
+            override fun onPageStarted(webView: WebView, url: String, favicon: Bitmap?) {
+                // Get the app bar layout height.  This can't be done in `applyAppSettings()` because the app bar is not yet populated there.
+                // This should only be populated if it is greater than 0 because otherwise it will be reset to 0 if the app bar is hidden in full screen browsing mode.
+                if (appBarLayout.height > 0)
+                    appBarHeight = appBarLayout.height
 
-                // Create an intent to open a chooser based on the file chooser parameters.
-                val fileChooserIntent = fileChooserParams.createIntent()
+                // Set the padding and layout settings according to the position of the app bar.
+                if (bottomAppBar) {  // The app bar is on the bottom.
+                    // Adjust the UI.
+                    if (scrollAppBar || (inFullScreenBrowsingMode && hideAppBar)) {  // The app bar scrolls or full screen browsing mode is engaged with the app bar hidden.
+                        // Reset the WebView padding to fill the available space.
+                        swipeRefreshLayout.setPadding(0, 0, 0, 0)
+                    } else {  // The app bar doesn't scroll or full screen browsing mode is not engaged with the app bar hidden.
+                        // Move the WebView above the app bar layout.
+                        swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
+                    }
+                } else {  // The app bar is on the top.
+                    // Set the top padding of the swipe refresh layout according to the app bar scrolling preference.  This can't be done in `appAppSettings()` because the app bar is not yet populated there.
+                    if (scrollAppBar || (inFullScreenBrowsingMode && hideAppBar)) {  // The app bar scrolls or full screen browsing mode is engaged with the app bar hidden.
+                        // No padding is needed because it will automatically be placed below the app bar layout due to the scrolling layout behavior.
+                        swipeRefreshLayout.setPadding(0, 0, 0, 0)
 
-                // Check to see if the file chooser intent resolves to an installed package.
-                if (fileChooserIntent.resolveActivity(packageManager) != null) {  // The file chooser intent is fine.
-                    // Launch the file chooser intent.
-                    browseFileUploadActivityResultLauncher.launch(fileChooserIntent)
-                } else {  // The file chooser intent will cause a crash.
-                    // Create a generic intent to open a chooser.
-                    val genericFileChooserIntent = Intent(Intent.ACTION_GET_CONTENT)
+                        // The swipe to refresh circle doesn't always hide itself completely unless it is moved up 10 pixels.
+                        swipeRefreshLayout.setProgressViewOffset(false, defaultProgressViewStartOffset - 10, defaultProgressViewEndOffset)
+                    } else {  // The app bar doesn't scroll or full screen browsing mode is not engaged with the app bar hidden.
+                        // The swipe refresh layout must be manually moved below the app bar layout.
+                        swipeRefreshLayout.setPadding(0, appBarHeight, 0, 0)
 
-                    // Request an openable file.
-                    genericFileChooserIntent.addCategory(Intent.CATEGORY_OPENABLE)
+                        // The swipe to refresh circle doesn't always hide itself completely unless it is moved up 10 pixels.
+                        swipeRefreshLayout.setProgressViewOffset(false, defaultProgressViewStartOffset - 10 + appBarHeight, defaultProgressViewEndOffset + appBarHeight)
+                    }
+                }
 
-                    // Set the file type to everything.
-                    genericFileChooserIntent.type = "*/*"
+                // Reset the list of resource requests.
+                nestedScrollWebView.clearResourceRequests()
 
-                    // Launch the generic file chooser intent.
-                    browseFileUploadActivityResultLauncher.launch(genericFileChooserIntent)
+                // Reset the requests counters.
+                nestedScrollWebView.resetRequestsCounters()
+
+                // Get the current page position.
+                val currentPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+
+                // Update the URL text bar if the page is currently selected and the URL edit text is not currently being edited.
+                if ((tabLayout.selectedTabPosition == currentPagePosition) && !urlEditText.hasFocus()) {
+                    // Display the formatted URL text.  The nested scroll WebView current URL preserves any initial `view-source:`, and opposed to the method URL variable.
+                    urlEditText.setText(nestedScrollWebView.currentUrl)
+
+                    // Highlight the URL syntax.
+                    UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
+
+                    // Hide the keyboard.
+                    inputMethodManager.hideSoftInputFromWindow(nestedScrollWebView.windowToken, 0)
                 }
 
-                // Handle the event.
-                return true
-            }
-        }
-        nestedScrollWebView.webViewClient = object : WebViewClient() {
-            // `shouldOverrideUrlLoading` makes this WebView the default handler for URLs inside the app, so that links are not kicked out to other apps.
-            override fun shouldOverrideUrlLoading(view: WebView, webResourceRequest: WebResourceRequest): Boolean {
-                // Get the URL from the web resource request.
-                var requestUrlString = webResourceRequest.url.toString()
+                // Reset the list of host IP addresses.
+                nestedScrollWebView.currentIpAddresses = ""
 
-                // Sanitize the url.
-                requestUrlString = sanitizeUrl(requestUrlString)
+                // Get a URI for the current URL.
+                val currentUri = Uri.parse(url)
 
-                // Handle the URL according to the type.
-                return if (requestUrlString.startsWith("http")) {  // Load the URL in Privacy Browser.
-                    // Load the URL.  By using `loadUrl()`, instead of `loadUrlFromBase()`, the Referer header will never be sent.
-                    loadUrl(nestedScrollWebView, requestUrlString)
+                // Get the current domain name.
+                val currentDomainName = currentUri.host
 
-                    // Returning true indicates that Privacy Browser is manually handling the loading of the URL.
-                    // Custom headers cannot be added if false is returned and the WebView handles the loading of the URL.
-                    true
-                } else if (requestUrlString.startsWith("mailto:")) {  // Load the email address in an external email program.
-                    // Use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
-                    val emailIntent = Intent(Intent.ACTION_SENDTO)
+                // Get the IP addresses for the current domain.
+                if (!currentDomainName.isNullOrEmpty())
+                    GetHostIpAddressesCoroutine.checkPinnedMismatch(currentDomainName, nestedScrollWebView, supportFragmentManager, getString(R.string.pinned_mismatch))
 
-                    // Parse the url and set it as the data for the intent.
-                    emailIntent.data = Uri.parse(requestUrlString)
+                // Replace Refresh with Stop if the options menu has been created and the WebView is currently displayed.  (The first WebView typically begins loading before the menu items are instantiated.)
+                if ((optionsMenu != null) && (webView == currentWebView)) {
+                    // Set the title.
+                    optionsRefreshMenuItem.setTitle(R.string.stop)
 
-                    // Open the email program in a new task instead of as part of Privacy Browser.
-                    emailIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                    // Set the icon if it is displayed in the AppBar.
+                    if (displayAdditionalAppBarIcons)
+                        optionsRefreshMenuItem.setIcon(R.drawable.close_blue)
+                }
+            }
 
-                    try {
-                        // Make it so.
-                        startActivity(emailIntent)
-                    } catch (exception: ActivityNotFoundException) {
-                        // Display a snackbar.
-                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
-                    }
+            override fun onPageFinished(webView: WebView, url: String) {
+                // Flush any cookies to persistent storage.  The cookie manager has become very lazy about flushing cookies in recent versions.
+                if (nestedScrollWebView.acceptCookies)
+                    cookieManager.flush()
 
-                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
-                    true
-                } else if (requestUrlString.startsWith("tel:")) {  // Load the phone number in the dialer.
-                    // Create a dial intent.
-                    val dialIntent = Intent(Intent.ACTION_DIAL)
+                // Update the Refresh menu item if the options menu has been created and the WebView is currently displayed.
+                if (optionsMenu != null && (webView == currentWebView)) {
+                    // Reset the Refresh title.
+                    optionsRefreshMenuItem.setTitle(R.string.refresh)
+
+                    // Reset the icon if it is displayed in the app bar.
+                    if (displayAdditionalAppBarIcons)
+                        optionsRefreshMenuItem.setIcon(R.drawable.refresh_enabled)
+                }
+
+                // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`,
+                // which links to `/data/data/com.stoutner.privacybrowser.standard`.
+                val privateDataDirectoryString = applicationInfo.dataDir
 
-                    // Add the phone number to the intent.
-                    dialIntent.data = Uri.parse(requestUrlString)
+                // Clear the cache, history, and logcat if Incognito Mode is enabled.
+                if (incognitoModeEnabled) {
+                    // Clear the cache.  `true` includes disk files.
+                    nestedScrollWebView.clearCache(true)
 
-                    // Open the dialer in a new task instead of as part of Privacy Browser.
-                    dialIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                    // Clear the back/forward history.
+                    nestedScrollWebView.clearHistory()
 
+                    // Manually delete cache folders.
                     try {
-                        // Make it so.
-                        startActivity(dialIntent)
-                    } catch (exception: ActivityNotFoundException) {
-                        // Display a snackbar.
-                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                        // Delete the main cache directory.
+                        Runtime.getRuntime().exec("rm -rf $privateDataDirectoryString/cache")
+                    } catch (exception: IOException) {
+                        // Do nothing if an error is thrown.
                     }
 
-                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
-                    true
-                } else {  // Load a system chooser to select an app that can handle the URL.
-                    // Create a generic intent to open an app.
-                    val genericIntent = Intent(Intent.ACTION_VIEW)
+                    // Clear the logcat.
+                    try {
+                        // Clear the logcat.  `-c` clears the logcat.  `-b all` clears all the buffers (instead of just crash, main, and system).
+                        Runtime.getRuntime().exec("logcat -b all -c")
+                    } catch (exception: IOException) {
+                        // Do nothing.
+                    }
+                }
 
-                    // Add the URL to the intent.
-                    genericIntent.data = Uri.parse(requestUrlString)
+                // Clear the `Service Worker` directory.
+                try {
+                    // A string array must be used because the directory contains a space and `Runtime.exec` will not escape the string correctly otherwise.
+                    Runtime.getRuntime().exec(arrayOf("rm", "-rf", "$privateDataDirectoryString/app_webview/Default/Service Worker/"))
+                } catch (exception: IOException) {
+                    // Do nothing.
+                }
 
-                    // List all apps that can handle the URL instead of just opening the first one.
-                    genericIntent.addCategory(Intent.CATEGORY_BROWSABLE)
+                // Get the current page position.
+                val currentPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-                    // Open the app in a new task instead of as part of Privacy Browser.
-                    genericIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                // Get the current URL from the nested scroll WebView.  This is more accurate than using the URL passed into the method, which is sometimes not the final one.
+                val currentUrl = nestedScrollWebView.url
 
-                    try {
-                        // Make it so.
-                        startActivity(genericIntent)
-                    } catch (exception: ActivityNotFoundException) {
-                        // Display a snackbar.
-                        Snackbar.make(nestedScrollWebView, getString(R.string.unrecognized_url, requestUrlString), Snackbar.LENGTH_SHORT).show()
-                    }
+                // Get the current tab.
+                val tab = tabLayout.getTabAt(currentPagePosition)
 
-                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
-                    true
-                }
-            }
+                // Update the URL text bar if the page is currently selected and the user is not currently typing in the URL edit text.
+                // Crash records show that, in some crazy way, it is possible for the current URL to be blank at this point.
+                // Probably some sort of race condition when Privacy Browser is being resumed.
+                if ((tabLayout.selectedTabPosition == currentPagePosition) && !urlEditText.hasFocus() && (currentUrl != null)) {
+                    // Check to see if the URL is `about:blank`.
+                    if (currentUrl == "about:blank") {  // The WebView is blank.
+                        // Display the hint in the URL edit text.
+                        urlEditText.setText("")
 
-            // Check requests against the block lists.
-            override fun shouldInterceptRequest(view: WebView, webResourceRequest: WebResourceRequest): WebResourceResponse? {
-                // Get the URL.
-                val requestUrlString = webResourceRequest.url.toString()
+                        // Request focus for the URL text box.
+                        urlEditText.requestFocus()
 
-                // Check to see if the resource request is for the main URL.
-                if (requestUrlString == nestedScrollWebView.currentUrl) {
-                    // `return null` loads the resource request, which should never be blocked if it is the main URL.
-                    return null
-                }
+                        // Display the keyboard.
+                        inputMethodManager.showSoftInput(urlEditText, 0)
 
-                // Wait until the blocklists have been populated.  When Privacy Browser is being resumed after having the process killed in the background it will try to load the URLs immediately.
-                while (ultraPrivacy == null) {
-                    try {
-                        // Check to see if the blocklists have been populated after 100 ms.
-                        Thread.sleep(100)
-                    } catch (exception: InterruptedException) {
-                        // Do nothing.
-                    }
-                }
+                        // Apply the domain settings.  This clears any settings from the previous domain.
+                        applyDomainSettings(nestedScrollWebView, "", resetTab = true, reloadWebsite = false, loadUrl = false)
 
-                // Create an empty web resource response to be used if the resource request is blocked.
-                val emptyWebResourceResponse = WebResourceResponse("text/plain", "utf8", ByteArrayInputStream("".toByteArray()))
+                        // Only populate the title text view if the tab has been fully created.
+                        if (tab != null) {
+                            // Get the custom view from the tab.
+                            val tabView = tab.customView!!
 
-                // Initialize the variables.
-                var whitelistResultStringArray: Array<String>? = null
-                var isThirdPartyRequest = false
+                            // Get the title text view from the tab.
+                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
 
-                // Get the current URL.  `.getUrl()` throws an error because operations on the WebView cannot be made from this thread.
-                var currentBaseDomain = nestedScrollWebView.currentDomainName
+                            // Set the title as the tab text.
+                            tabTitleTextView.setText(R.string.new_tab)
+                        }
+                    } else {  // The WebView has loaded a webpage.
+                        // Update the URL edit text if it is not currently being edited.
+                        if (!urlEditText.hasFocus()) {
+                            // Sanitize the current URL.  This removes unwanted URL elements that were added by redirects, so that they won't be included if the URL is shared.
+                            val sanitizedUrl = sanitizeUrl(currentUrl)
 
-                // Store a copy of the current domain for use in later requests.
-                val currentDomain = currentBaseDomain
+                            // Display the final URL.  Getting the URL from the WebView instead of using the one provided by `onPageFinished()` makes websites like YouTube function correctly.
+                            urlEditText.setText(sanitizedUrl)
 
-                // Get the request host name.
-                var requestBaseDomain = webResourceRequest.url.host
+                            // Highlight the URL syntax.
+                            UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
+                        }
 
-                // Only check for third-party requests if the current base domain is not empty and the request domain is not null.
-                if (currentBaseDomain.isNotEmpty() && (requestBaseDomain != null)) {
-                    // Determine the current base domain.
-                    while (currentBaseDomain.indexOf(".", currentBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
-                        // Remove the first subdomain.
-                        currentBaseDomain = currentBaseDomain.substring(currentBaseDomain.indexOf(".") + 1)
-                    }
+                        // Only populate the title text view if the tab has been fully created.
+                        if (tab != null) {
+                            // Get the custom view from the tab.
+                            val tabView = tab.customView!!
 
-                    // Determine the request base domain.
-                    while (requestBaseDomain!!.indexOf(".", requestBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
-                        // Remove the first subdomain.
-                        requestBaseDomain = requestBaseDomain.substring(requestBaseDomain.indexOf(".") + 1)
-                    }
+                            // Get the title text view from the tab.
+                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
 
-                    // Update the third party request tracker.
-                    isThirdPartyRequest = currentBaseDomain != requestBaseDomain
+                            // Set the title as the tab text.  Sometimes `onReceivedTitle()` is not called, especially when navigating history.
+                            tabTitleTextView.text = nestedScrollWebView.title
+                        }
+                    }
                 }
+            }
 
-                // Get the current WebView page position.
-                val webViewPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+            // Handle SSL Certificate errors.  Suppress the lint warning that ignoring the error might be dangerous.
+            @SuppressLint("WebViewClientOnReceivedSslError")
+            override fun onReceivedSslError(view: WebView, handler: SslErrorHandler, error: SslError) {
+                // Get the current website SSL certificate.
+                val currentWebsiteSslCertificate = error.certificate
 
-                // Determine if the WebView is currently displayed.
-                val webViewDisplayed = webViewPagePosition == tabLayout.selectedTabPosition
+                // Extract the individual pieces of information from the current website SSL certificate.
+                val currentWebsiteIssuedToCName = currentWebsiteSslCertificate.issuedTo.cName
+                val currentWebsiteIssuedToOName = currentWebsiteSslCertificate.issuedTo.oName
+                val currentWebsiteIssuedToUName = currentWebsiteSslCertificate.issuedTo.uName
+                val currentWebsiteIssuedByCName = currentWebsiteSslCertificate.issuedBy.cName
+                val currentWebsiteIssuedByOName = currentWebsiteSslCertificate.issuedBy.oName
+                val currentWebsiteIssuedByUName = currentWebsiteSslCertificate.issuedBy.uName
+                val currentWebsiteSslStartDate = currentWebsiteSslCertificate.validNotBeforeDate
+                val currentWebsiteSslEndDate = currentWebsiteSslCertificate.validNotAfterDate
 
-                // Block third-party requests if enabled.
-                if (isThirdPartyRequest && nestedScrollWebView.blockAllThirdPartyRequests) {
-                    // Add the result to the resource requests.
-                    nestedScrollWebView.addResourceRequest(arrayOf(BlocklistHelper.REQUEST_THIRD_PARTY, requestUrlString))
+                // Get the pinned SSL certificate.
+                val (pinnedSslCertificateStringArray, pinnedSslCertificateDateArray) = nestedScrollWebView.getPinnedSslCertificate()
 
-                    // Increment the blocked requests counters.
-                    nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                    nestedScrollWebView.incrementRequestsCount(THIRD_PARTY_REQUESTS)
+                // Proceed to the website if the current SSL website certificate matches the pinned domain certificate.
+                if (nestedScrollWebView.hasPinnedSslCertificate() &&
+                    (currentWebsiteIssuedToCName == pinnedSslCertificateStringArray[0]) &&
+                    (currentWebsiteIssuedToOName == pinnedSslCertificateStringArray[1]) &&
+                    (currentWebsiteIssuedToUName == pinnedSslCertificateStringArray[2]) &&
+                    (currentWebsiteIssuedByCName == pinnedSslCertificateStringArray[3]) &&
+                    (currentWebsiteIssuedByOName == pinnedSslCertificateStringArray[4]) &&
+                    (currentWebsiteIssuedByUName == pinnedSslCertificateStringArray[5]) &&
+                    (currentWebsiteSslStartDate == pinnedSslCertificateDateArray[0]) &&
+                    (currentWebsiteSslEndDate == pinnedSslCertificateDateArray[1])) {
 
-                    // Update the titles of the blocklist menu items if the WebView is currently displayed.
-                    if (webViewDisplayed) {
-                        // Updating the UI must be run from the UI thread.
-                        runOnUiThread {
-                            // Update the menu item titles.
-                            navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+                    // An SSL certificate is pinned and matches the current domain certificate.  Proceed to the website without displaying an error.
+                    handler.proceed()
+                } else {  // Either there isn't a pinned SSL certificate or it doesn't match the current website certificate.
+                    // Store the SSL error handler.
+                    nestedScrollWebView.sslErrorHandler = handler
 
-                            // Update the options menu if it has been populated.
-                            if (optionsMenu != null) {
-                                optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
-                                optionsBlockAllThirdPartyRequestsMenuItem.title =
-                                    nestedScrollWebView.getRequestsCount(THIRD_PARTY_REQUESTS).toString() + " - " + getString(R.string.block_all_third_party_requests)
-                            }
-                        }
-                    }
+                    // Instantiate an SSL certificate error alert dialog.
+                    val sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error, nestedScrollWebView.webViewFragmentId)
 
-                    // The resource request was blocked.  Return an empty web resource response.
-                    return emptyWebResourceResponse
+                    // Try to show the dialog.  The SSL error handler continues to function even when the WebView is paused.  Attempting to display a dialog in that state leads to a crash.
+                    try {
+                        // Show the SSL certificate error dialog.
+                        sslCertificateErrorDialogFragment.show(supportFragmentManager, getString(R.string.ssl_certificate_error))
+                    } catch (exception: Exception) {
+                        // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
+                        pendingDialogsArrayList.add(PendingDialogDataClass(sslCertificateErrorDialogFragment, getString(R.string.ssl_certificate_error)))
+                    }
                 }
+            }
+        }
 
-                // Check UltraList if it is enabled.
-                if (nestedScrollWebView.ultraListEnabled) {
-                    // Check the URL against UltraList.
-                    val ultraListResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, ultraList)
+        // Check to see if the state is being restored.
+        if (restoringState) {  // The state is being restored.
+            // Resume the nested scroll WebView JavaScript timers.
+            nestedScrollWebView.resumeTimers()
+        } else if (pagePosition == 0) {  // The first page is being loaded.
+            // Set this nested scroll WebView as the current WebView.
+            currentWebView = nestedScrollWebView
 
-                    // Process the UltraList results.
-                    if (ultraListResults[0] == BlocklistHelper.REQUEST_BLOCKED) {  // The resource request matched UltraList's blacklist.
-                        // Add the result to the resource requests.
-                        nestedScrollWebView.addResourceRequest(arrayOf(ultraListResults[0], ultraListResults[1], ultraListResults[2], ultraListResults[3], ultraListResults[4], ultraListResults[5]))
+            // Get the intent that started the app.
+            val launchingIntent = intent
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(ULTRALIST)
+            // Reset the intent.  This prevents a duplicate tab from being created on restart.
+            intent = Intent()
 
-                        // Update the titles of the blocklist menu items if the WebView is currently displayed.
-                        if (webViewDisplayed) {
-                            // Updating the UI must be run from the UI thread.
-                            runOnUiThread {
-                                // Update the menu item titles.
-                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+            // Get the information from the intent.
+            val launchingIntentAction = launchingIntent.action
+            val launchingIntentUriData = launchingIntent.data
+            val launchingIntentStringExtra = launchingIntent.getStringExtra(Intent.EXTRA_TEXT)
+
+            // Parse the launching intent URL.  Suppress the suggestions of using elvis expressions as they make the logic very difficult to follow.
+            @Suppress("IfThenToElvis") val urlToLoadString = if ((launchingIntentAction != null) && (launchingIntentAction == Intent.ACTION_WEB_SEARCH)) {  // The intent contains a search string.
+                // Sanitize the search input and convert it to a search.
+                val encodedSearchString = try {
+                    URLEncoder.encode(launchingIntent.getStringExtra(SearchManager.QUERY), "UTF-8")
+                } catch (exception: UnsupportedEncodingException) {
+                    ""
+                }
+
+                // Add the search URL to the encodedSearchString
+                searchURL + encodedSearchString
+            } else if (launchingIntentUriData != null) {  // The launching intent contains a URL formatted as a URI.
+                // Get the URL from the URI.
+                launchingIntentUriData.toString()
+            } else if (launchingIntentStringExtra != null) {  // The launching intent contains text that might be a URL.
+                // Get the URL from the string extra.
+                launchingIntentStringExtra
+            } else if (urlString != "") {  // The activity has been restarted.
+                // Load the saved URL.
+                urlString
+            } else {  // The is no saved URL and there is no URL in the intent.
+                // Load the homepage.
+                sharedPreferences.getString("homepage", getString(R.string.homepage_default_value))
+            }
 
-                                // Update the options menu if it has been populated.
-                                if (optionsMenu != null) {
-                                    optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
-                                    optionsUltraListMenuItem.title = nestedScrollWebView.getRequestsCount(ULTRALIST).toString() + " - " + getString(R.string.ultralist)
-                                }
-                            }
-                        }
+            // Load the website if not waiting for the proxy.
+            if (waitingForProxy) {  // Store the URL to be loaded in the Nested Scroll WebView.
+                nestedScrollWebView.waitingForProxyUrlString = urlToLoadString!!
+            } else {  // Load the URL.
+                loadUrl(nestedScrollWebView, urlToLoadString!!)
+            }
+        } else {  // This is not the first tab.
+            // Load the URL.
+            loadUrl(nestedScrollWebView, urlString)
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse
-                    } else if (ultraListResults[0] == BlocklistHelper.REQUEST_ALLOWED) {  // The resource request matched UltraList's whitelist.
-                        // Add a whitelist entry to the resource requests array.
-                        nestedScrollWebView.addResourceRequest(arrayOf(ultraListResults[0], ultraListResults[1], ultraListResults[2], ultraListResults[3], ultraListResults[4], ultraListResults[5]))
+            // Set the focus and display the keyboard if the URL is blank.
+            if (urlString == "") {
+                // Request focus for the URL text box.
+                urlEditText.requestFocus()
 
-                        // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
-                        return null
-                    }
+                // Display the keyboard once the tab layout has settled.
+                tabLayout.post {
+                    inputMethodManager.showSoftInput(urlEditText, 0)
                 }
+            }
+        }
+    }
 
-                // Check UltraPrivacy if it is enabled.
-                if (nestedScrollWebView.ultraPrivacyEnabled) {
-                    // Check the URL against UltraPrivacy.
-                    val ultraPrivacyResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, ultraPrivacy!!)
-
-                    // Process the UltraPrivacy results.
-                    if (ultraPrivacyResults[0] == BlocklistHelper.REQUEST_BLOCKED) {  // The resource request matched UltraPrivacy's blacklist.
-                        // Add the result to the resource requests.
-                        nestedScrollWebView.addResourceRequest(arrayOf(ultraPrivacyResults[0], ultraPrivacyResults[1], ultraPrivacyResults[2], ultraPrivacyResults[3], ultraPrivacyResults[4],
-                            ultraPrivacyResults[5]))
+    private fun loadBookmarksFolder() {
+        // Update the bookmarks cursor with the contents of the bookmarks database for the current folder.
+        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolderId)
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(ULTRAPRIVACY)
+        // Populate the bookmarks cursor adapter.
+        bookmarksCursorAdapter = object : CursorAdapter(this, bookmarksCursor, false) {
+            override fun newView(context: Context, cursor: Cursor, parent: ViewGroup): View {
+                // Inflate the individual item layout.
+                return layoutInflater.inflate(R.layout.bookmarks_drawer_item_linearlayout, parent, false)
+            }
 
-                        // Update the titles of the blocklist menu items if the WebView is currently displayed.
-                        if (webViewDisplayed) {
-                            // Updating the UI must be run from the UI thread.
-                            runOnUiThread {
-                                // Update the menu item titles.
-                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+            override fun bindView(view: View, context: Context, cursor: Cursor) {
+                // Get handles for the views.
+                val bookmarkFavoriteIcon = view.findViewById<ImageView>(R.id.bookmark_favorite_icon)
+                val bookmarkNameTextView = view.findViewById<TextView>(R.id.bookmark_name)
 
-                                // Update the options menu if it has been populated.
-                                if (optionsMenu != null) {
-                                    optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
-                                    optionsUltraPrivacyMenuItem.title = nestedScrollWebView.getRequestsCount(ULTRAPRIVACY).toString() + " - " + getString(R.string.ultraprivacy)
-                                }
-                            }
-                        }
+                // Get the favorite icon byte array from the cursor.
+                val favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndexOrThrow(FAVORITE_ICON))
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse
-                    } else if (ultraPrivacyResults[0] == BlocklistHelper.REQUEST_ALLOWED) {  // The resource request matched UltraPrivacy's whitelist.
-                        // Add a whitelist entry to the resource requests array.
-                        nestedScrollWebView.addResourceRequest(arrayOf(ultraPrivacyResults[0], ultraPrivacyResults[1], ultraPrivacyResults[2], ultraPrivacyResults[3], ultraPrivacyResults[4],
-                            ultraPrivacyResults[5]))
+                // Convert the byte array to a bitmap beginning at the first byte and ending at the last.
+                val favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.size)
 
-                        // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
-                        return null
-                    }
-                }
+                // Display the bitmap in the bookmark favorite icon.
+                bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap)
 
-                // Check EasyList if it is enabled.
-                if (nestedScrollWebView.easyListEnabled) {
-                    // Check the URL against EasyList.
-                    val easyListResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, easyList)
+                // Display the bookmark name from the cursor in the bookmark name text view.
+                bookmarkNameTextView.text = cursor.getString(cursor.getColumnIndexOrThrow(BOOKMARK_NAME))
 
-                    // Process the EasyList results.
-                    if (easyListResults[0] == BlocklistHelper.REQUEST_BLOCKED) {  // The resource request matched EasyList's blacklist.
-                        // Add the result to the resource requests.
-                        nestedScrollWebView.addResourceRequest(arrayOf(easyListResults[0], easyListResults[1], easyListResults[2], easyListResults[3], easyListResults[4], easyListResults[5]))
+                // Make the font bold for folders.
+                if (cursor.getInt(cursor.getColumnIndexOrThrow(IS_FOLDER)) == 1)
+                    bookmarkNameTextView.typeface = Typeface.DEFAULT_BOLD
+                else  // Reset the font to default for normal bookmarks.
+                    bookmarkNameTextView.typeface = Typeface.DEFAULT
+            }
+        }
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(EASYLIST)
+        // Populate the list view with the adapter.
+        bookmarksListView.adapter = bookmarksCursorAdapter
 
-                        // Update the titles of the blocklist menu items if the WebView is currently displayed.
-                        if (webViewDisplayed) {
-                            // Updating the UI must be run from the UI thread.
-                            runOnUiThread {
-                                // Update the menu item titles.
-                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+        // Set the bookmarks drawer title.
+        if (currentBookmarksFolderId == HOME_FOLDER_ID)  // The current bookmarks folder is the home folder.
+            bookmarksTitleTextView.setText(R.string.bookmarks)
+        else
+            bookmarksTitleTextView.text = bookmarksDatabaseHelper!!.getFolderName(currentBookmarksFolderId)
+    }
 
-                                // Update the options menu if it has been populated.
-                                if (optionsMenu != null) {
-                                    optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
-                                    optionsEasyListMenuItem.title = nestedScrollWebView.getRequestsCount(EASYLIST).toString() + " - " + getString(R.string.easylist)
-                                }
-                            }
-                        }
+    private fun loadUrl(nestedScrollWebView: NestedScrollWebView, url: String) {
+        // Sanitize the URL.
+        val urlString = sanitizeUrl(url)
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse
-                    } else if (easyListResults[0] == BlocklistHelper.REQUEST_ALLOWED) {  // The resource request matched EasyList's whitelist.
-                        // Update the whitelist result string array tracker.
-                        whitelistResultStringArray = arrayOf(easyListResults[0], easyListResults[1], easyListResults[2], easyListResults[3], easyListResults[4], easyListResults[5])
-                    }
-                }
+        // Apply the domain settings and load the URL.
+        applyDomainSettings(nestedScrollWebView, urlString, resetTab = true, reloadWebsite = false, loadUrl = true)
+    }
 
-                // Check EasyPrivacy if it is enabled.
-                if (nestedScrollWebView.easyPrivacyEnabled) {
-                    // Check the URL against EasyPrivacy.
-                    val easyPrivacyResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, easyPrivacy)
+    private fun loadUrlFromTextBox() {
+        // Get the text from URL text box and convert it to a string.  trim() removes white spaces from the beginning and end of the string.
+        var unformattedUrlString = urlEditText.text.toString().trim { it <= ' ' }
 
-                    // Process the EasyPrivacy results.
-                    if (easyPrivacyResults[0] == BlocklistHelper.REQUEST_BLOCKED) {  // The resource request matched EasyPrivacy's blacklist.
-                        // Add the result to the resource requests.
-                        nestedScrollWebView.addResourceRequest(arrayOf(easyPrivacyResults[0], easyPrivacyResults[1], easyPrivacyResults[2], easyPrivacyResults[3], easyPrivacyResults[4], easyPrivacyResults[5]))
+        // Create the formatted URL string.
+        var urlString = ""
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(EASYPRIVACY)
+        // Check to see if the unformatted URL string is a valid URL.  Otherwise, convert it into a search.
+        if (unformattedUrlString.startsWith("content://") || unformattedUrlString.startsWith("view-source:")) {  // This is a content or source URL.
+            // Load the entire content URL.
+            urlString = unformattedUrlString
+        } else if (Patterns.WEB_URL.matcher(unformattedUrlString).matches() || unformattedUrlString.startsWith("http://") || unformattedUrlString.startsWith("https://") ||
+            unformattedUrlString.startsWith("file://")) {  // This is a standard URL.
 
-                        // Update the titles of the blocklist menu items if the WebView is currently displayed.
-                        if (webViewDisplayed) {
-                            // Updating the UI must be run from the UI thread.
-                            runOnUiThread {
-                                // Update the menu item titles.
-                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+            // Add `https://` at the beginning if there is no protocol.  Otherwise the app will segfault.
+            if (!unformattedUrlString.startsWith("http") && !unformattedUrlString.startsWith("file://"))
+                unformattedUrlString = "https://$unformattedUrlString"
 
-                                // Update the options menu if it has been populated.
-                                if (optionsMenu != null) {
-                                    optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
-                                    optionsEasyPrivacyMenuItem.title = nestedScrollWebView.getRequestsCount(EASYPRIVACY).toString() + " - " + getString(R.string.easyprivacy)
-                                }
-                            }
-                        }
+            // Initialize the unformatted URL.
+            var unformattedUrl: URL? = null
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse
-                    } else if (easyPrivacyResults[0] == BlocklistHelper.REQUEST_ALLOWED) {  // The resource request matched EasyPrivacy's whitelist.
-                        // Update the whitelist result string array tracker.
-                        whitelistResultStringArray = arrayOf(easyPrivacyResults[0], easyPrivacyResults[1], easyPrivacyResults[2], easyPrivacyResults[3], easyPrivacyResults[4], easyPrivacyResults[5])
-                    }
-                }
+            // Convert the unformatted URL string to a URL.
+            try {
+                unformattedUrl = URL(unformattedUrlString)
+            } catch (exception: MalformedURLException) {
+                exception.printStackTrace()
+            }
 
-                // Check Fanboy’s Annoyance List if it is enabled.
-                if (nestedScrollWebView.fanboysAnnoyanceListEnabled) {
-                    // Check the URL against Fanboy's Annoyance List.
-                    val fanboysAnnoyanceListResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, fanboysAnnoyanceList)
+            // Get the components of the URL.
+            val scheme = unformattedUrl?.protocol
+            val authority = unformattedUrl?.authority
+            val path = unformattedUrl?.path
+            val query = unformattedUrl?.query
+            val fragment = unformattedUrl?.ref
 
-                    // Process the Fanboy's Annoyance List results.
-                    if (fanboysAnnoyanceListResults[0] == BlocklistHelper.REQUEST_BLOCKED) {  // The resource request matched Fanboy's Annoyance List's blacklist.
-                        // Add the result to the resource requests.
-                        nestedScrollWebView.addResourceRequest(arrayOf(fanboysAnnoyanceListResults[0], fanboysAnnoyanceListResults[1], fanboysAnnoyanceListResults[2], fanboysAnnoyanceListResults[3],
-                                fanboysAnnoyanceListResults[4], fanboysAnnoyanceListResults[5]))
+            // Create a URI.
+            val uri = Uri.Builder()
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(FANBOYS_ANNOYANCE_LIST)
+            // Build the URI from the components of the URL.
+            uri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment)
 
-                        // Update the titles of the blocklist menu items if the WebView is currently displayed.
-                        if (webViewDisplayed) {
-                            // Updating the UI must be run from the UI thread.
-                            runOnUiThread {
-                                // Update the menu item titles.
-                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+            // Decode the URI as a UTF-8 string in.
+            try {
+                urlString = URLDecoder.decode(uri.build().toString(), "UTF-8")
+            } catch (exception: UnsupportedEncodingException) {
+                // Do nothing.  The formatted URL string will remain blank.
+            }
+        } else if (unformattedUrlString.isNotEmpty()) {  // This is not a URL, but rather a search string.
+            // Sanitize the search input.
+            val encodedSearchString = try {
+                URLEncoder.encode(unformattedUrlString, "UTF-8")
+            } catch (exception: UnsupportedEncodingException) {
+                ""
+            }
 
-                                // Update the options menu if it has been populated.
-                                if (optionsMenu != null) {
-                                    optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
-                                    optionsFanboysAnnoyanceListMenuItem.title = nestedScrollWebView.getRequestsCount(FANBOYS_ANNOYANCE_LIST).toString() + " - " + getString(R.string.fanboys_annoyance_list)
-                                }
-                            }
-                        }
+            // Add the base search URL.
+            urlString = searchURL + encodedSearchString
+        }
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse
-                    } else if (fanboysAnnoyanceListResults[0] == BlocklistHelper.REQUEST_ALLOWED) {  // The resource request matched Fanboy's Annoyance List's whitelist.
-                        // Update the whitelist result string array tracker.
-                        whitelistResultStringArray = arrayOf(fanboysAnnoyanceListResults[0], fanboysAnnoyanceListResults[1], fanboysAnnoyanceListResults[2], fanboysAnnoyanceListResults[3],
-                            fanboysAnnoyanceListResults[4], fanboysAnnoyanceListResults[5])
-                    }
-                } else if (nestedScrollWebView.fanboysSocialBlockingListEnabled) {  // Only check Fanboy’s Social Blocking List if Fanboy’s Annoyance List is disabled.
-                    // Check the URL against Fanboy's Annoyance List.
-                    val fanboysSocialListResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, fanboysSocialList)
+        // Clear the focus from the URL edit text.  Otherwise, proximate typing in the box will retain the colorized formatting instead of being reset during refocus.
+        urlEditText.clearFocus()
 
-                    // Process the Fanboy's Social Blocking List results.
-                    if (fanboysSocialListResults[0] == BlocklistHelper.REQUEST_BLOCKED) {  // The resource request matched Fanboy's Social Blocking List's blacklist.
-                        // Add the result to the resource requests.
-                        nestedScrollWebView.addResourceRequest(arrayOf(fanboysSocialListResults[0], fanboysSocialListResults[1], fanboysSocialListResults[2], fanboysSocialListResults[3],
-                            fanboysSocialListResults[4], fanboysSocialListResults[5]))
+        // Make it so.
+        loadUrl(currentWebView!!, urlString)
+    }
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(FANBOYS_SOCIAL_BLOCKING_LIST)
+    override fun navigateHistory(steps: Int) {
+        // Get the current web back forward list.
+        val webBackForwardList = currentWebView!!.copyBackForwardList()
 
-                        // Update the titles of the blocklist menu items if the WebView is currently displayed.
-                        if (webViewDisplayed) {
-                            // Updating the UI must be run from the UI thread.
-                            runOnUiThread {
-                                // Update the menu item titles.
-                                navigationRequestsMenuItem.title = getString(R.string.requests) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
+        // Calculate the target index.
+        val targetIndex = webBackForwardList.currentIndex + steps
 
-                                // Update the options menu if it has been populated.
-                                if (optionsMenu != null) {
-                                    optionsBlocklistsMenuItem.title = getString(R.string.blocklists) + " - " + nestedScrollWebView.getRequestsCount(BLOCKED_REQUESTS)
-                                    optionsFanboysSocialBlockingListMenuItem.title =
-                                        nestedScrollWebView.getRequestsCount(FANBOYS_SOCIAL_BLOCKING_LIST).toString() + " - " + getString(R.string.fanboys_social_blocking_list)
-                                }
-                            }
-                        }
+        // Get the previous entry data.
+        val previousUrl = webBackForwardList.getItemAtIndex(targetIndex).url
+        val previousFavoriteIcon = webBackForwardList.getItemAtIndex(targetIndex).favicon
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse
-                    } else if (fanboysSocialListResults[0] == BlocklistHelper.REQUEST_ALLOWED) {  // The resource request matched Fanboy's Social Blocking List's whitelist.
-                        // Update the whitelist result string array tracker.
-                        whitelistResultStringArray = arrayOf(fanboysSocialListResults[0], fanboysSocialListResults[1], fanboysSocialListResults[2], fanboysSocialListResults[3], fanboysSocialListResults[4],
-                            fanboysSocialListResults[5])
-                    }
-                }
+        // Apply the domain settings.
+        applyDomainSettings(currentWebView!!, previousUrl, resetTab = false, reloadWebsite = false, loadUrl = false)
 
-                // Add the request to the log because it hasn't been processed by any of the previous checks.
-                if (whitelistResultStringArray != null) {  // The request was processed by a whitelist.
-                    nestedScrollWebView.addResourceRequest(whitelistResultStringArray)
-                } else {  // The request didn't match any blocklist entry.  Log it as a default request.
-                    nestedScrollWebView.addResourceRequest(arrayOf(BlocklistHelper.REQUEST_DEFAULT, requestUrlString))
-                }
+        // Get the current tab.
+        val tab = tabLayout.getTabAt(tabLayout.selectedTabPosition)!!
 
-                // The resource request has not been blocked.  `return null` loads the requested resource.
-                return null
-            }
+        // Get the custom view from the tab.
+        val tabView = tab.customView!!
 
-            // Handle HTTP authentication requests.
-            override fun onReceivedHttpAuthRequest(view: WebView, handler: HttpAuthHandler, host: String, realm: String) {
-                // Store the handler.
-                nestedScrollWebView.httpAuthHandler = handler
+        // Get the favorite icon image view from the tab.
+        val tabFavoriteIconImageView = tabView.findViewById<ImageView>(R.id.favorite_icon_imageview)
 
-                // Instantiate an HTTP authentication dialog.
-                val httpAuthenticationDialogFragment = HttpAuthenticationDialog.displayDialog(host, realm, nestedScrollWebView.webViewFragmentId)
+        // Store the previous favorite icon.
+        if (previousFavoriteIcon == null)
+            currentWebView!!.setFavoriteIcon(defaultFavoriteIconBitmap)
+        else
+            currentWebView!!.setFavoriteIcon(previousFavoriteIcon)
 
-                // Show the HTTP authentication dialog.
-                httpAuthenticationDialogFragment.show(supportFragmentManager, getString(R.string.http_authentication))
-            }
+        // Display the previous favorite icon in the tab.
+        tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(currentWebView!!.getFavoriteIcon(), 64, 64, true))
 
-            override fun onPageStarted(webView: WebView, url: String, favicon: Bitmap?) {
-                // Get the app bar layout height.  This can't be done in `applyAppSettings()` because the app bar is not yet populated there.
-                // This should only be populated if it is greater than 0 because otherwise it will be reset to 0 if the app bar is hidden in full screen browsing mode.
-                if (appBarLayout.height > 0)
-                    appBarHeight = appBarLayout.height
+        // Load the history entry.
+        currentWebView!!.goBackOrForward(steps)
 
-                // Set the padding and layout settings according to the position of the app bar.
-                if (bottomAppBar) {  // The app bar is on the bottom.
-                    // Adjust the UI.
-                    if (scrollAppBar || (inFullScreenBrowsingMode && hideAppBar)) {  // The app bar scrolls or full screen browsing mode is engaged with the app bar hidden.
-                        // Reset the WebView padding to fill the available space.
-                        swipeRefreshLayout.setPadding(0, 0, 0, 0)
-                    } else {  // The app bar doesn't scroll or full screen browsing mode is not engaged with the app bar hidden.
-                        // Move the WebView above the app bar layout.
-                        swipeRefreshLayout.setPadding(0, 0, 0, appBarHeight)
-                    }
-                } else {  // The app bar is on the top.
-                    // Set the top padding of the swipe refresh layout according to the app bar scrolling preference.  This can't be done in `appAppSettings()` because the app bar is not yet populated there.
-                    if (scrollAppBar || (inFullScreenBrowsingMode && hideAppBar)) {  // The app bar scrolls or full screen browsing mode is engaged with the app bar hidden.
-                        // No padding is needed because it will automatically be placed below the app bar layout due to the scrolling layout behavior.
-                        swipeRefreshLayout.setPadding(0, 0, 0, 0)
+        // Create a handler to update the URL edit box.
+        val urlEditTextUpdateHandler = Handler(Looper.getMainLooper())
 
-                        // The swipe to refresh circle doesn't always hide itself completely unless it is moved up 10 pixels.
-                        swipeRefreshLayout.setProgressViewOffset(false, defaultProgressViewStartOffset - 10, defaultProgressViewEndOffset)
-                    } else {  // The app bar doesn't scroll or full screen browsing mode is not engaged with the app bar hidden.
-                        // The swipe refresh layout must be manually moved below the app bar layout.
-                        swipeRefreshLayout.setPadding(0, appBarHeight, 0, 0)
+        // Create a runnable to update the URL edit box.
+        val urlEditTextUpdateRunnable = Runnable {
+            // Update the URL edit text.
+            urlEditText.setText(currentWebView!!.url)
 
-                        // The swipe to refresh circle doesn't always hide itself completely unless it is moved up 10 pixels.
-                        swipeRefreshLayout.setProgressViewOffset(false, defaultProgressViewStartOffset - 10 + appBarHeight, defaultProgressViewEndOffset + appBarHeight)
-                    }
-                }
+            // Disable the wide viewport if the source is being viewed.
+            if (currentWebView!!.url!!.startsWith("view-source:"))
+                currentWebView!!.settings.useWideViewPort = false
+        }
 
-                // Reset the list of resource requests.
-                nestedScrollWebView.clearResourceRequests()
+        // Update the URL edit text after 50 milliseconds, so that the WebView has enough time to navigate to the new URL.
+        urlEditTextUpdateHandler.postDelayed(urlEditTextUpdateRunnable, 50)
+    }
 
-                // Reset the requests counters.
-                nestedScrollWebView.resetRequestsCounters()
+    override fun openFile(dialogFragment: DialogFragment) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
 
-                // Get the current page position.
-                val currentPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+        // Get handles for the views.
+        val fileNameEditText = dialog.findViewById<EditText>(R.id.file_name_edittext)
+        val mhtCheckBox = dialog.findViewById<CheckBox>(R.id.mht_checkbox)
 
-                // Update the URL text bar if the page is currently selected and the URL edit text is not currently being edited.
-                if ((tabLayout.selectedTabPosition == currentPagePosition) && !urlEditText.hasFocus()) {
-                    // Display the formatted URL text.
-                    urlEditText.setText(url)
+        // Get the file path string.
+        val openFilePath = fileNameEditText.text.toString()
 
-                    // Highlight the URL syntax.
-                    UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
+        // Apply the domain settings.  This resets the favorite icon and removes any domain settings.
+        applyDomainSettings(currentWebView!!, openFilePath, resetTab = true, reloadWebsite = false, loadUrl = false)
 
-                    // Hide the keyboard.
-                    inputMethodManager.hideSoftInputFromWindow(nestedScrollWebView.windowToken, 0)
-                }
+        // Open the file according to the type.
+        if (mhtCheckBox.isChecked) {  // Force opening of an MHT file.
+            try {
+                // Get the MHT file input stream.
+                val mhtFileInputStream = contentResolver.openInputStream(Uri.parse(openFilePath))
 
-                // Reset the list of host IP addresses.
-                nestedScrollWebView.currentIpAddresses = ""
+                // Create a temporary MHT file.
+                val temporaryMhtFile = File.createTempFile(TEMPORARY_MHT_FILE, ".mht", cacheDir)
 
-                // Get a URI for the current URL.
-                val currentUri = Uri.parse(url)
+                // Get a file output stream for the temporary MHT file.
+                val temporaryMhtFileOutputStream = FileOutputStream(temporaryMhtFile)
 
-                // Get the current domain name.
-                val currentDomainName = currentUri.host
+                // Create a transfer byte array.
+                val transferByteArray = ByteArray(1024)
 
-                // Get the IP addresses for the current domain.
-                if ((currentDomainName != null) && currentDomainName.isNotEmpty())
-                    GetHostIpAddressesCoroutine.checkPinnedMismatch(currentDomainName, nestedScrollWebView, supportFragmentManager, getString(R.string.pinned_mismatch))
+                // Create an integer to track the number of bytes read.
+                var bytesRead: Int
 
-                // Replace Refresh with Stop if the options menu has been created and the WebView is currently displayed.  (The first WebView typically begins loading before the menu items are instantiated.)
-                if ((optionsMenu != null) && (webView == currentWebView)) {
-                    // Set the title.
-                    optionsRefreshMenuItem.setTitle(R.string.stop)
+                // Copy the temporary MHT file input stream to the MHT output stream.
+                while (mhtFileInputStream!!.read(transferByteArray).also { bytesRead = it } > 0)
+                    temporaryMhtFileOutputStream.write(transferByteArray, 0, bytesRead)
 
-                    // Set the icon if it is displayed in the AppBar.
-                    if (displayAdditionalAppBarIcons)
-                        optionsRefreshMenuItem.setIcon(R.drawable.close_blue)
-                }
+                // Flush the temporary MHT file output stream.
+                temporaryMhtFileOutputStream.flush()
+
+                // Close the streams.
+                temporaryMhtFileOutputStream.close()
+                mhtFileInputStream.close()
+
+                // Load the temporary MHT file.
+                currentWebView!!.loadUrl(temporaryMhtFile.toString())
+            } catch (exception: Exception) {
+                // Display a snackbar.
+                Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
             }
+        } else {  // Let the WebView handle opening of the file.
+            // Open the file.
+            currentWebView!!.loadUrl(openFilePath)
+        }
+    }
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun openNavigationDrawer(@Suppress("UNUSED_PARAMETER")view: View) {
+        // Open the navigation drawer.
+        drawerLayout.openDrawer(GravityCompat.START)
+    }
 
-            override fun onPageFinished(webView: WebView, url: String) {
-                // Flush any cookies to persistent storage.  The cookie manager has become very lazy about flushing cookies in recent versions.
-                if (nestedScrollWebView.acceptCookies)
-                    cookieManager.flush()
+    private fun openWithApp(url: String) {
+        // Create an open with app intent with `ACTION_VIEW`.
+        val openWithAppIntent = Intent(Intent.ACTION_VIEW)
 
-                // Update the Refresh menu item if the options menu has been created and the WebView is currently displayed.
-                if (optionsMenu != null && (webView == currentWebView)) {
-                    // Reset the Refresh title.
-                    optionsRefreshMenuItem.setTitle(R.string.refresh)
+        // Set the URI but not the MIME type.  This should open all available apps.
+        openWithAppIntent.data = Uri.parse(url)
 
-                    // Reset the icon if it is displayed in the app bar.
-                    if (displayAdditionalAppBarIcons)
-                        optionsRefreshMenuItem.setIcon(R.drawable.refresh_enabled)
-                }
+        // Flag the intent to open in a new task.
+        openWithAppIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`,
-                // which links to `/data/data/com.stoutner.privacybrowser.standard`.
-                val privateDataDirectoryString = applicationInfo.dataDir
+        // Try the intent.
+        try {
+            // Show the chooser.
+            startActivity(openWithAppIntent)
+        } catch (exception: ActivityNotFoundException) {  // There are no apps available to open the URL.
+            // Show a snackbar with the error.
+            Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+        }
+    }
 
-                // Clear the cache, history, and logcat if Incognito Mode is enabled.
-                if (incognitoModeEnabled) {
-                    // Clear the cache.  `true` includes disk files.
-                    nestedScrollWebView.clearCache(true)
+    private fun openWithBrowser(url: String) {
 
-                    // Clear the back/forward history.
-                    nestedScrollWebView.clearHistory()
+        // Create an open with browser intent with `ACTION_VIEW`.
+        val openWithBrowserIntent = Intent(Intent.ACTION_VIEW)
 
-                    // Manually delete cache folders.
-                    try {
-                        // Delete the main cache directory.
-                        Runtime.getRuntime().exec("rm -rf $privateDataDirectoryString/cache")
-                    } catch (exception: IOException) {
-                        // Do nothing if an error is thrown.
-                    }
+        // Set the URI and the MIME type.  `"text/html"` should load browser options.
+        openWithBrowserIntent.setDataAndType(Uri.parse(url), "text/html")
 
-                    // Clear the logcat.
-                    try {
-                        // Clear the logcat.  `-c` clears the logcat.  `-b all` clears all the buffers (instead of just crash, main, and system).
-                        Runtime.getRuntime().exec("logcat -b all -c")
-                    } catch (exception: IOException) {
-                        // Do nothing.
-                    }
-                }
+        // Flag the intent to open in a new task.
+        openWithBrowserIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                // Clear the `Service Worker` directory.
-                try {
-                    // A string array must be used because the directory contains a space and `Runtime.exec` will not escape the string correctly otherwise.
-                    Runtime.getRuntime().exec(arrayOf("rm", "-rf", "$privateDataDirectoryString/app_webview/Default/Service Worker/"))
-                } catch (exception: IOException) {
-                    // Do nothing.
-                }
+        // Try the intent.
+        try {
+            // Show the chooser.
+            startActivity(openWithBrowserIntent)
+        } catch (exception: ActivityNotFoundException) {  // There are no browsers available to open the URL.
+            // Show a snackbar with the error.
+            Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+        }
+    }
 
-                // Get the current page position.
-                val currentPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+    override fun pinnedErrorGoBack() {
+        // Navigate back one page.
+        navigateHistory(-1)
+    }
 
-                // Get the current URL from the nested scroll WebView.  This is more accurate than using the URL passed into the method, which is sometimes not the final one.
-                val currentUrl = nestedScrollWebView.url
+    private fun sanitizeUrl(urlString: String): String {
+        // Initialize a sanitized URL string.
+        var sanitizedUrlString = urlString
 
-                // Get the current tab.
-                val tab = tabLayout.getTabAt(currentPagePosition)
+        // Sanitize tracking queries.
+        if (sanitizeTrackingQueries)
+            sanitizedUrlString = SanitizeUrlHelper.sanitizeTrackingQueries(sanitizedUrlString)
 
-                // Update the URL text bar if the page is currently selected and the user is not currently typing in the URL edit text.
-                // Crash records show that, in some crazy way, it is possible for the current URL to be blank at this point.
-                // Probably some sort of race condition when Privacy Browser is being resumed.
-                if ((tabLayout.selectedTabPosition == currentPagePosition) && !urlEditText.hasFocus() && (currentUrl != null)) {
-                    // Check to see if the URL is `about:blank`.
-                    if (currentUrl == "about:blank") {  // The WebView is blank.
-                        // Display the hint in the URL edit text.
-                        urlEditText.setText("")
+        // Sanitize AMP redirects.
+        if (sanitizeAmpRedirects)
+            sanitizedUrlString = SanitizeUrlHelper.sanitizeAmpRedirects(sanitizedUrlString)
 
-                        // Request focus for the URL text box.
-                        urlEditText.requestFocus()
+        // Return the sanitized URL string.
+        return sanitizedUrlString
+    }
 
-                        // Display the keyboard.
-                        inputMethodManager.showSoftInput(urlEditText, 0)
+    override fun saveWithAndroidDownloadManager(dialogFragment: DialogFragment) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
 
-                        // Apply the domain settings.  This clears any settings from the previous domain.
-                        applyDomainSettings(nestedScrollWebView, "", resetTab = true, reloadWebsite = false, loadUrl = false)
+        // Get handles for the dialog views.
+        val dialogUrlEditText = dialog.findViewById<EditText>(R.id.url_edittext)
+        val downloadDirectoryRadioGroup = dialog.findViewById<RadioGroup>(R.id.download_directory_radiogroup)
+        val dialogFileNameEditText = dialog.findViewById<EditText>(R.id.file_name_edittext)
 
-                        // Only populate the title text view if the tab has been fully created.
-                        if (tab != null) {
-                            // Get the custom view from the tab.
-                            val tabView = tab.customView!!
+        // Get the string from the edit texts, which may have been modified by the user.
+        val saveUrlString = dialogUrlEditText.text.toString()
+        val fileNameString = dialogFileNameEditText.text.toString()
 
-                            // Get the title text view from the tab.
-                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
+        // Get a handle for the system download service.
+        val downloadManager = getSystemService(DOWNLOAD_SERVICE) as DownloadManager
 
-                            // Set the title as the tab text.
-                            tabTitleTextView.setText(R.string.new_tab)
-                        }
-                    } else {  // The WebView has loaded a webpage.
-                        // Update the URL edit text if it is not currently being edited.
-                        if (!urlEditText.hasFocus()) {
-                            // Sanitize the current URL.  This removes unwanted URL elements that were added by redirects, so that they won't be included if the URL is shared.
-                            val sanitizedUrl = sanitizeUrl(currentUrl)
+        // Parse the URL.
+        val downloadRequest = DownloadManager.Request(Uri.parse(saveUrlString))
 
-                            // Display the final URL.  Getting the URL from the WebView instead of using the one provided by `onPageFinished()` makes websites like YouTube function correctly.
-                            urlEditText.setText(sanitizedUrl)
+        // Pass cookies to download manager if cookies are enabled.  This is required to download files from websites that require a login.
+        // Code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
+        if (cookieManager.acceptCookie()) {
+            // Get the cookies for the URL.
+            val cookiesString = cookieManager.getCookie(saveUrlString)
 
-                            // Highlight the URL syntax.
-                            UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
-                        }
+            // Add the cookies to the download request.  In the HTTP request header, cookies are named `Cookie`.
+            downloadRequest.addRequestHeader("Cookie", cookiesString)
+        }
+
+        // Get the download directory.
+        val downloadDirectory = when (downloadDirectoryRadioGroup.checkedRadioButtonId) {
+            R.id.downloads_radiobutton -> Environment.DIRECTORY_DOWNLOADS
+            R.id.documents_radiobutton -> Environment.DIRECTORY_DOCUMENTS
+            R.id.pictures_radiobutton -> Environment.DIRECTORY_PICTURES
+            else -> Environment.DIRECTORY_MUSIC
+        }
+
+        // Set the download destination.
+        downloadRequest.setDestinationInExternalPublicDir(downloadDirectory, fileNameString)
+
+        // Allow media scanner to index the download if it is a media file.  This is automatic for API >= 29.
+        @Suppress("DEPRECATION")
+        if (Build.VERSION.SDK_INT <= 28)
+            downloadRequest.allowScanningByMediaScanner()
 
-                        // Only populate the title text view if the tab has been fully created.
-                        if (tab != null) {
-                            // Get the custom view from the tab.
-                            val tabView = tab.customView!!
+        // Add the URL as the description for the download.
+        downloadRequest.setDescription(saveUrlString)
 
-                            // Get the title text view from the tab.
-                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
+        // Show the download notification after the download is completed.
+        downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
 
-                            // Set the title as the tab text.  Sometimes `onReceivedTitle()` is not called, especially when navigating history.
-                            tabTitleTextView.text = nestedScrollWebView.title
-                        }
-                    }
-                }
-            }
+        // Initiate the download.
+        downloadManager.enqueue(downloadRequest)
+    }
 
-            // Handle SSL Certificate errors.  Suppress the lint warning that ignoring the error might be dangerous.
-            @SuppressLint("WebViewClientOnReceivedSslError")
-            override fun onReceivedSslError(view: WebView, handler: SslErrorHandler, error: SslError) {
-                // Get the current website SSL certificate.
-                val currentWebsiteSslCertificate = error.certificate
+    private fun saveWithExternalApp(url: String) {
+        // Create a download intent.  Not specifying the action type will display the maximum number of options.
+        val downloadIntent = Intent()
 
-                // Extract the individual pieces of information from the current website SSL certificate.
-                val currentWebsiteIssuedToCName = currentWebsiteSslCertificate.issuedTo.cName
-                val currentWebsiteIssuedToOName = currentWebsiteSslCertificate.issuedTo.oName
-                val currentWebsiteIssuedToUName = currentWebsiteSslCertificate.issuedTo.uName
-                val currentWebsiteIssuedByCName = currentWebsiteSslCertificate.issuedBy.cName
-                val currentWebsiteIssuedByOName = currentWebsiteSslCertificate.issuedBy.oName
-                val currentWebsiteIssuedByUName = currentWebsiteSslCertificate.issuedBy.uName
-                val currentWebsiteSslStartDate = currentWebsiteSslCertificate.validNotBeforeDate
-                val currentWebsiteSslEndDate = currentWebsiteSslCertificate.validNotAfterDate
+        // Set the URI and the mime type.
+        downloadIntent.setDataAndType(Uri.parse(url), "text/html")
 
-                // Get the pinned SSL certificate.
-                val (pinnedSslCertificateStringArray, pinnedSslCertificateDateArray) = nestedScrollWebView.getPinnedSslCertificate()
+        // Flag the intent to open in a new task.
+        downloadIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                // Proceed to the website if the current SSL website certificate matches the pinned domain certificate.
-                if (nestedScrollWebView.hasPinnedSslCertificate() &&
-                    (currentWebsiteIssuedToCName == pinnedSslCertificateStringArray[0]) &&
-                    (currentWebsiteIssuedToOName == pinnedSslCertificateStringArray[1]) &&
-                    (currentWebsiteIssuedToUName == pinnedSslCertificateStringArray[2]) &&
-                    (currentWebsiteIssuedByCName == pinnedSslCertificateStringArray[3]) &&
-                    (currentWebsiteIssuedByOName == pinnedSslCertificateStringArray[4]) &&
-                    (currentWebsiteIssuedByUName == pinnedSslCertificateStringArray[5]) &&
-                    (currentWebsiteSslStartDate == pinnedSslCertificateDateArray[0]) &&
-                    (currentWebsiteSslEndDate == pinnedSslCertificateDateArray[1])) {
+        // Show the chooser.
+        startActivity(Intent.createChooser(downloadIntent, getString(R.string.download_with_external_app)))
+    }
 
-                    // An SSL certificate is pinned and matches the current domain certificate.  Proceed to the website without displaying an error.
-                    handler.proceed()
-                } else {  // Either there isn't a pinned SSL certificate or it doesn't match the current website certificate.
-                    // Store the SSL error handler.
-                    nestedScrollWebView.sslErrorHandler = handler
+    override fun saveWithPrivacyBrowser(originalUrlString: String, fileNameString: String, dialogFragment: DialogFragment) {
+        // Store the URL.  This will be used in the save URL activity result launcher.
+        saveUrlString = if (originalUrlString.startsWith("data:")) {
+            // Save the original URL.
+            originalUrlString
+        } else {
+            // Get the dialog.
+            val dialog = dialogFragment.dialog!!
 
-                    // Instantiate an SSL certificate error alert dialog.
-                    val sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error, nestedScrollWebView.webViewFragmentId)
+            // Get a handle for the dialog URL edit text.
+            val dialogUrlEditText = dialog.findViewById<EditText>(R.id.url_edittext)
 
-                    // Try to show the dialog.  The SSL error handler continues to function even when the WebView is paused.  Attempting to display a dialog in that state leads to a crash.
-                    try {
-                        // Show the SSL certificate error dialog.
-                        sslCertificateErrorDialogFragment.show(supportFragmentManager, getString(R.string.ssl_certificate_error))
-                    } catch (exception: Exception) {
-                        // Add the dialog to the pending dialog array list.  It will be displayed in `onStart()`.
-                        pendingDialogsArrayList.add(PendingDialogDataClass(sslCertificateErrorDialogFragment, getString(R.string.ssl_certificate_error)))
-                    }
-                }
-            }
+            // Get the URL from the edit text, which may have been modified by the user.
+            dialogUrlEditText.text.toString()
         }
 
-        // Check to see if the state is being restored.
-        if (restoringState) {  // The state is being restored.
-            // Resume the nested scroll WebView JavaScript timers.
-            nestedScrollWebView.resumeTimers()
-        } else if (pageNumber == 0) {  // The first page is being loaded.
-            // Set this nested scroll WebView as the current WebView.
-            currentWebView = nestedScrollWebView
+        // Open the file picker.
+        saveUrlActivityResultLauncher.launch(fileNameString)
+    }
 
-            // Get the intent that started the app.
-            val launchingIntent = intent
+    private fun setCurrentWebView(pageNumber: Int) {
+        // Stop the swipe to refresh indicator if it is running
+        swipeRefreshLayout.isRefreshing = false
 
-            // Reset the intent.  This prevents a duplicate tab from being created on restart.
-            intent = Intent()
+        // Try to set the current WebView.  This will fail if the WebView has not yet been populated.
+        try {
+            // Get the WebView tab fragment.
+            val webViewTabFragment = webViewStateAdapter!!.getPageFragment(pageNumber)
 
-            // Get the information from the intent.
-            val launchingIntentAction = launchingIntent.action
-            val launchingIntentUriData = launchingIntent.data
-            val launchingIntentStringExtra = launchingIntent.getStringExtra(Intent.EXTRA_TEXT)
+            // Get the fragment view.
+            val webViewFragmentView = webViewTabFragment.view
 
-            // Parse the launching intent URL.  Suppress the suggestions of using elvis expressions as they make the logic very difficult to follow.
-            @Suppress("IfThenToElvis") val urlToLoadString = if ((launchingIntentAction != null) && (launchingIntentAction == Intent.ACTION_WEB_SEARCH)) {  // The intent contains a search string.
-                // Sanitize the search input and convert it to a search.
-                val encodedSearchString = try {
-                    URLEncoder.encode(launchingIntent.getStringExtra(SearchManager.QUERY), "UTF-8")
-                } catch (exception: UnsupportedEncodingException) {
-                    ""
-                }
+            // Store the current WebView.
+            currentWebView = webViewFragmentView!!.findViewById(R.id.nestedscroll_webview)
 
-                // Add the search URL to the encodedSearchString
-                searchURL + encodedSearchString
-            } else if (launchingIntentUriData != null) {  // The launching intent contains a URL formatted as a URI.
-                // Get the URL from the URI.
-                launchingIntentUriData.toString()
-            } else if (launchingIntentStringExtra != null) {  // The launching intent contains text that might be a URL.
-                // Get the URL from the string extra.
-                launchingIntentStringExtra
-            } else if (urlString != "") {  // The activity has been restarted.
-                // Load the saved URL.
-                urlString
-            } else {  // The is no saved URL and there is no URL in the intent.
-                // Load the homepage.
-                sharedPreferences.getString("homepage", getString(R.string.homepage_default_value))
+            // Update the status of swipe to refresh.
+            if (currentWebView!!.swipeToRefresh) {  // Swipe to refresh is enabled.
+                // Enable the swipe refresh layout if the WebView is scrolled all the way to the top.  It is updated every time the scroll changes.
+                swipeRefreshLayout.isEnabled = (currentWebView!!.scrollY == 0)
+            } else {  // Swipe to refresh is disabled.
+                // Disable the swipe refresh layout.
+                swipeRefreshLayout.isEnabled = false
             }
 
-            // Load the website if not waiting for the proxy.
-            if (waitingForProxy) {  // Store the URL to be loaded in the Nested Scroll WebView.
-                nestedScrollWebView.waitingForProxyUrlString = urlToLoadString!!
-            } else {  // Load the URL.
-                loadUrl(nestedScrollWebView, urlToLoadString!!)
-            }
+            // Set the cookie status.
+            cookieManager.setAcceptCookie(currentWebView!!.acceptCookies)
 
-            // Reset the intent.  This prevents a duplicate tab from being created on a subsequent restart if loading an link from a new intent on restart.
-            // For example, this prevents a duplicate tab if a link is loaded from the Guide after changing the theme in the guide and then changing the theme again in the main activity.
-            intent = Intent()
-        } else {  // This is not the first tab.
-            // Load the URL.
-            loadUrl(nestedScrollWebView, urlString)
+            // Update the privacy icons.  `true` redraws the icons in the app bar.
+            updatePrivacyIcons(true)
 
-            // Set the focus and display the keyboard if the URL is blank.
-            if (urlString == "") {
-                // Request focus for the URL text box.
-                urlEditText.requestFocus()
+            // Get a handle for the input method manager.
+            val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
+
+            // Get the current URL.
+            val urlString = currentWebView!!.url
+
+            // Update the URL edit text if not loading a new intent.  Otherwise, this will be handled by `onPageStarted()` (if called) and `onPageFinished()`.
+            if (!loadingNewIntent) {  // A new intent is not being loaded.
+                if ((urlString == null) || (urlString == "about:blank")) {  // The WebView is blank.
+                    // Display the hint in the URL edit text.
+                    urlEditText.setText("")
 
-                // Create a display keyboard handler.
-                val displayKeyboardHandler = Handler(Looper.getMainLooper())
+                    // Request focus for the URL text box.
+                    urlEditText.requestFocus()
 
-                // Create a display keyboard runnable.
-                val displayKeyboardRunnable = Runnable {
                     // Display the keyboard.
                     inputMethodManager.showSoftInput(urlEditText, 0)
+                } else {  // The WebView has a loaded URL.
+                    // Clear the focus from the URL text box.
+                    urlEditText.clearFocus()
+
+                    // Hide the soft keyboard.
+                    inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
+
+                    // Display the current URL in the URL text box.
+                    urlEditText.setText(urlString)
+
+                    // Highlight the URL syntax.
+                    UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
                 }
+            } else {  // A new intent is being loaded.
+                // Reset the loading new intent flag.
+                loadingNewIntent = false
+            }
+
+            // Set the background to indicate the domain settings status.
+            if (currentWebView!!.domainSettingsApplied) {
+                // Set a background on the URL relative layout to indicate that custom domain settings are being used.
+                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.drawable.domain_settings_url_background)
+            } else {
+                // Remove any background on the URL relative layout.
+                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.color.transparent)
+            }
+        }  catch (exception: Exception) {  //  Try again in 10 milliseconds if the WebView has not yet been populated.
+            // Create a handler to set the current WebView.
+            val setCurrentWebViewHandler = Handler(Looper.getMainLooper())
 
-                // Display the keyboard after 100 milliseconds, which leaves enough time for the tab to transition.
-                displayKeyboardHandler.postDelayed(displayKeyboardRunnable, 100)
+            // Create a runnable to set the current WebView.
+            val setCurrentWebWebRunnable = Runnable {
+                // Set the current WebView.
+                setCurrentWebView(pageNumber)
             }
+
+            // Try setting the current WebView again after 10 milliseconds.
+            setCurrentWebViewHandler.postDelayed(setCurrentWebWebRunnable, 10)
         }
     }
 
+    // The view parameter cannot be removed because it is called from the layout onClick.
+    fun toggleBookmarksDrawerPinned(@Suppress("UNUSED_PARAMETER")view: View?) {
+        // Toggle the bookmarks drawer pinned tracker.
+        bookmarksDrawerPinned = !bookmarksDrawerPinned
+
+        // Update the bookmarks drawer pinned image view.
+        updateBookmarksDrawerPinnedImageView()
+    }
+
+    private fun updateBookmarksDrawerPinnedImageView() {
+        // Set the current icon.
+        if (bookmarksDrawerPinned)
+            bookmarksDrawerPinnedImageView.setImageResource(R.drawable.pin_selected)
+        else
+            bookmarksDrawerPinnedImageView.setImageResource(R.drawable.pin)
+    }
+
     private fun updateDomainsSettingsSet() {
         // Reset the domains settings set.
         domainsSettingsSet = HashSet()
@@ -5912,7 +6255,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         val domainsCount = domainsCursor.count
 
         // Get the domain name column index.
-        val domainNameColumnIndex = domainsCursor.getColumnIndexOrThrow(DomainsDatabaseHelper.DOMAIN_NAME)
+        val domainNameColumnIndex = domainsCursor.getColumnIndexOrThrow(DOMAIN_NAME)
 
         // Populate the domain settings set.
         for (i in 0 until domainsCount) {
@@ -5926,4 +6269,54 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         // Close the domains cursor.
         domainsCursor.close()
     }
+
+    override fun updateFontSize(dialogFragment: DialogFragment) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
+
+        // Get a handle for the font size edit text.
+        val fontSizeEditText = dialog.findViewById<EditText>(R.id.font_size_edittext)
+
+        // Initialize the new font size variable with the current font size.
+        var newFontSize = currentWebView!!.settings.textZoom
+
+        // Get the font size from the edit text.
+        try {
+            newFontSize = fontSizeEditText.text.toString().toInt()
+        } catch (exception: Exception) {
+            // If the edit text does not contain a valid font size do nothing.
+        }
+
+        // Apply the new font size.
+        currentWebView!!.settings.textZoom = newFontSize
+    }
+
+    private fun updatePrivacyIcons(runInvalidateOptionsMenu: Boolean) {
+        // Only update the privacy icons if the options menu and the current WebView have already been populated.
+        if ((optionsMenu != null) && (currentWebView != null)) {
+            // Update the privacy icon.
+            if (currentWebView!!.settings.javaScriptEnabled)  // JavaScript is enabled.
+                optionsPrivacyMenuItem.setIcon(R.drawable.javascript_enabled)
+            else if (currentWebView!!.acceptCookies)  // JavaScript is disabled but cookies are enabled.
+                optionsPrivacyMenuItem.setIcon(R.drawable.warning)
+            else  // All the dangerous features are disabled.
+                optionsPrivacyMenuItem.setIcon(R.drawable.privacy_mode)
+
+            // Update the cookies icon.
+            if (currentWebView!!.acceptCookies)
+                optionsCookiesMenuItem.setIcon(R.drawable.cookies_enabled)
+            else
+                optionsCookiesMenuItem.setIcon(R.drawable.cookies_disabled)
+
+            // Update the refresh icon.
+            if (optionsRefreshMenuItem.title == getString(R.string.refresh))  // The refresh icon is displayed.
+                optionsRefreshMenuItem.setIcon(R.drawable.refresh_enabled)
+            else  // The stop icon is displayed.
+                optionsRefreshMenuItem.setIcon(R.drawable.close_blue)
+
+            // `invalidateOptionsMenu()` calls `onPrepareOptionsMenu()` and redraws the icons in the app bar.
+            if (runInvalidateOptionsMenu)
+                invalidateOptionsMenu()
+        }
+    }
 }