]> gitweb.stoutner.com Git - PrivacyBrowserAndroid.git/blobdiff - app/src/main/java/com/stoutner/privacybrowser/activities/MainWebViewActivity.kt
Use the secret built-in View Source. https://redmine.stoutner.com/issues/1023
[PrivacyBrowserAndroid.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebViewActivity.kt
index d56d9b71727e49b92ac1f3ebc4edb3594ab0fd86..c6d91350ea3a2116eca251efa663e3bbd276749f 100644 (file)
@@ -105,7 +105,7 @@ import androidx.drawerlayout.widget.DrawerLayout
 import androidx.fragment.app.DialogFragment
 import androidx.preference.PreferenceManager
 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 +116,9 @@ 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 +137,47 @@ 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_FORM_DATA
+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 +188,6 @@ 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
 
@@ -195,21 +233,19 @@ 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
@@ -217,12 +253,17 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
     // 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>>>
@@ -241,7 +282,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     private lateinit var navigationRequestsMenuItem: MenuItem
     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
@@ -254,6 +294,7 @@ 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
@@ -280,6 +321,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     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
@@ -292,10 +334,13 @@ 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: ArrayAdapter<CharSequence>
 
     // Define the class variables.
     private var actionBarDrawerToggle: ActionBarDrawerToggle? = null
@@ -305,12 +350,25 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
     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 defaultFormData = false  // Form data can be removed once the minimum API >= 26.
     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
@@ -332,6 +390,12 @@ 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.
@@ -438,12 +502,6 @@ 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)
@@ -485,7 +543,7 @@ 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.
@@ -529,7 +587,7 @@ 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)
+            webViewViewPager2 = findViewById(R.id.webview_viewpager2)
             val navigationView = findViewById<NavigationView>(R.id.navigationview)
             bookmarksListView = findViewById(R.id.bookmarks_drawer_listview)
             bookmarksTitleTextView = findViewById(R.id.bookmarks_title_textview)
@@ -567,20 +625,23 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             // 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)
 
             // Set the pager adapter on the web view pager.
-            webViewPager.adapter = webViewPagerAdapter
+            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()
@@ -625,12 +686,12 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
                         // 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()
+
+                        // Update the URL edit text after a delay.
+                        updateUrlEditTextAfterDelay()
+                    } else {  // Close the current tab.
+                        // A view is required because the method is also called by an XML `onClick`.
+                        closeTab(null)
                     }
                 }
             }
@@ -638,14 +699,23 @@ 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)
         }
     }
 
+    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 onNewIntent(intent: Intent) {
         // Run the default commands.
         super.onNewIntent(intent)
@@ -708,7 +778,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
             }
         } 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.
+            // The tab position is 0 based, meaning the new tab will be the tab position that is restored.
             if ((intentUriData != null) || (intentStringExtra != null) || isWebSearch)
                 savedTabPosition = savedStateArrayList!!.size
 
@@ -739,9 +809,9 @@ 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 +852,11 @@ 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 +907,20 @@ 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 +955,37 @@ 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 +1003,23 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         super.onDestroy()
     }
 
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        // Run the default commands.
+        super.onConfigurationChanged(newConfig)
+
+        // 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.
+            webViewViewPager2.currentItem = (currentPage - 1)
+
+            // Switch back to the current page after the view pager has quiesced.
+            webViewViewPager2.post { webViewViewPager2.currentItem = currentPage }
+        }
+    }
+
     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)
@@ -948,11 +1035,11 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         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)
@@ -980,6 +1067,7 @@ 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.
@@ -992,9 +1080,6 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         // 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)
@@ -1045,7 +1130,7 @@ 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.
+            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 +1142,13 @@ 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 +1161,15 @@ 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.
@@ -1289,11 +1380,11 @@ 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 +1427,11 @@ 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()
@@ -1361,9 +1452,9 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
                 // Display a snackbar.
                 if (currentWebView!!.settings.domStorageEnabled)
-                    Snackbar.make(webViewPager, R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show()
                 else
-                    Snackbar.make(webViewPager, R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show()
 
                 // Reload the current WebView.
                 currentWebView!!.reload()
@@ -1384,9 +1475,9 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
                 // 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.form_data_enabled, Snackbar.LENGTH_SHORT).show()
                 else
-                    Snackbar.make(webViewPager, R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(webViewViewPager2, R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show()
 
                 // Update the privacy icon.
                 updatePrivacyIcons(true)
@@ -1400,7 +1491,7 @@ 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 +1509,7 @@ 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) {
@@ -1475,7 +1566,7 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
             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)
+                Snackbar.make(webViewViewPager2, 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) {
@@ -1835,7 +1926,7 @@ 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)
                 )
 
@@ -1923,15 +2014,29 @@ 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.
+                    addNewTab(currentWebView!!.currentUrl.substring(12, currentWebView!!.currentUrl.length), true)
+                } else {  // The rendered website is currently viewed.
+                    // Open the source in a new tab.
+                    addNewTab("view-source:${currentWebView!!.currentUrl}", 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
@@ -2129,6 +2234,9 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
                     // Load the previous website in the history.
                     currentWebView!!.goBack()
+
+                    // Update the URL edit text after a delay.
+                    updateUrlEditTextAfterDelay()
                 }
             }
 
@@ -2146,6 +2254,9 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
 
                     // Load the next website in the history.
                     currentWebView!!.goForward()
+
+                    // Update the URL edit text after a delay.
+                    updateUrlEditTextAfterDelay()
                 }
             }
 
@@ -2318,11 +2429,11 @@ 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 +2447,6 @@ 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
@@ -2668,3239 +2770,3284 @@ class MainWebViewActivity : AppCompatActivity(), CreateBookmarkDialog.CreateBook
         }
     }
 
-    override fun onCreateBookmark(dialogFragment: DialogFragment, favoriteIconBitmap: Bitmap) {
-        // Get the dialog.
-        val dialog = dialogFragment.dialog!!
-
-        // 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)
-
-        // Extract the strings from the edit texts.
-        val bookmarkNameString = createBookmarkNameEditText.text.toString()
-        val bookmarkUrlString = createBookmarkUrlEditText.text.toString()
+    // 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)
+    }
 
-        // Create a favorite icon byte array output stream.
-        val favoriteIconByteArrayOutputStream = ByteArrayOutputStream()
+    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()
 
-        // 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)
+        // 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
 
-        // Convert the favorite icon byte array stream to a byte array.
-        val favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray()
+        // Add a new tab.
+        tabLayout.addTab(tabLayout.newTab())
 
-        // Display the new bookmark below the current items in the (0 indexed) list.
-        val newBookmarkDisplayOrder = bookmarksListView.count
+        // Get the new tab.
+        val newTab = tabLayout.getTabAt(newTabNumber)!!
 
-        // Create the bookmark.
-        bookmarksDatabaseHelper!!.createBookmark(bookmarkNameString, bookmarkUrlString, currentBookmarksFolder, newBookmarkDisplayOrder, favoriteIconByteArray)
+        // Set a custom view on the new tab.
+        newTab.setCustomView(R.layout.tab_custom_view)
 
-        // Update the bookmarks cursor with the current contents of this folder.
-        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolder)
+        // Add the new WebView page.
+        webViewStateAdapter!!.addPage(newTabNumber, webViewViewPager2, urlString, moveToTab)
 
-        // Update the list view.
-        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
+        // 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)
 
-        // Scroll to the new bookmark.
-        bookmarksListView.setSelection(newBookmarkDisplayOrder)
+            // Make it so.
+            objectAnimator.start()
+        }
     }
 
-    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)
-
-        // Get new folder name string.
-        val folderNameString = folderNameEditText.text.toString()
+    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)
+        defaultFormData = sharedPreferences.getBoolean(getString(R.string.save_form_data_key), false)  // Form data can be removed once the minimum API >= 26.
+        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 WebView theme entry values string array.  This is 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)
+
+        // Get the user agent array adapter and string array.  These are done here so that expensive resource requests are not made each time a domain is loaded.
+        userAgentNamesArray = ArrayAdapter.createFromResource(this, R.array.user_agent_names, R.layout.spinner_item)
+        userAgentDataArray = resources.getStringArray(R.array.user_agent_data)
 
-        // 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
+        // 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)
 
-            // Convert the folder icon drawable to a bitmap drawable.
-            val folderIconBitmapDrawable = folderIconDrawable as BitmapDrawable
+        // Apply the saved proxy mode if the app has been restarted.
+        if (savedProxyMode != null) {
+            // Apply the saved proxy mode.
+            proxyMode = savedProxyMode!!
 
-            // 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
+            // Reset the saved proxy mode.
+            savedProxyMode = null
         }
 
-        // Create a folder icon byte array output stream.
-        val folderIconByteArrayOutputStream = ByteArrayOutputStream()
+        // Get the search string.
+        val searchString = sharedPreferences.getString(getString(R.string.search_key), getString(R.string.search_default_value))!!
 
-        // 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)
+        // 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
 
-        // Convert the folder icon byte array stream to a byte array.
-        val folderIconByteArray = folderIconByteArrayOutputStream.toByteArray()
+        // Apply the proxy.
+        applyProxy(false)
 
-        // 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()
+        // 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)
 
-            // Move the bookmark down one slot.
-            bookmarksDatabaseHelper!!.updateDisplayOrder(databaseId, i + 1)
-        }
+                // 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)
 
-        // Create the folder, which will be placed at the top of the list view.
-        bookmarksDatabaseHelper!!.createFolder(folderNameString, currentBookmarksFolder, folderIconByteArray)
+                    // 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
 
-        // Update the bookmarks cursor with the current contents of this folder.
-        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolder)
+            // 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
 
-        // Update the list view.
-        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
+                // Expand the app bar if it is currently collapsed.
+                appBarLayout.setExpanded(true)
+            }
 
-        // Scroll to the new folder.
-        bookmarksListView.setSelection(0)
-    }
+            // 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)
 
-    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 <= ' ' }
+                // Get the fragment view.
+                val fragmentView = webViewTabFragment.view
 
-        // Create the formatted URL string.
-        var urlString = ""
+                // 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)
 
-        // 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.
+                    // Set the app bar scrolling.
+                    nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
+                }
+            }
+        }
 
-            // 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 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
 
-            // Initialize the unformatted URL.
-            var unformattedUrl: URL? = null
+                // Hide the app bar.
+                appBar.hide()
+            } else {
+                // Show the tab linear layout.
+                tabsLinearLayout.visibility = View.VISIBLE
 
-            // Convert the unformatted URL string to a URL.
-            try {
-                unformattedUrl = URL(unformattedUrlString)
-            } catch (exception: MalformedURLException) {
-                exception.printStackTrace()
+                // Show the app bar.
+                appBar.show()
             }
 
-            // 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
+            /* 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.
+             */
 
-            // Create a URI.
-            val uri = Uri.Builder()
+            // 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
 
-            // Build the URI from the components of the URL.
-            uri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment)
+            // Show the tab linear layout.
+            tabsLinearLayout.visibility = View.VISIBLE
 
-            // 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) {
-                ""
-            }
+            // Show the app bar.
+            appBar.show()
 
-            // Add the base search URL.
-            urlString = searchURL + encodedSearchString
+            // 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 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()
+    // `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!!
 
-        // Make it so.
-        loadUrl(currentWebView!!, urlString)
-    }
+        // Parse the URL into a URI.
+        val uri = Uri.parse(url)
 
-    private fun loadUrl(nestedScrollWebView: NestedScrollWebView, url: String) {
-        // Sanitize the URL.
-        val urlString = sanitizeUrl(url)
+        // Extract the domain from the URI.
+        var newHostName = uri.host
 
-        // Apply the domain settings and load the URL.
-        applyDomainSettings(nestedScrollWebView, urlString, resetTab = true, reloadWebsite = false, loadUrl = true)
-    }
+        // Strings don't like to be null.
+        if (newHostName == null)
+            newHostName = ""
 
-    // 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)
-    }
+        // 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
 
-    // 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)
-    }
+            // Reset the ignoring of pinned domain information.
+            nestedScrollWebView.ignorePinnedDomainInformation = false
 
-    // 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
+            // Clear any pinned SSL certificate or IP addresses.
+            nestedScrollWebView.clearPinnedSslCertificate()
+            nestedScrollWebView.pinnedIpAddresses = ""
 
-        // Clear the highlighted phrases if the WebView is not null.
-        currentWebView?.clearMatches()
+            // Reset the favorite icon if specified.
+            if (resetTab) {
+                // Initialize the favorite icon.
+                nestedScrollWebView.initializeFavoriteIcon()
 
-        // Hide the find on page linear layout.
-        findOnPageLinearLayout.visibility = View.GONE
+                // Get the current page position.
+                val currentPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-        // Show the toolbar.
-        toolbar.visibility = View.VISIBLE
+                // Get the corresponding tab.
+                val tab = tabLayout.getTabAt(currentPagePosition)
 
-        // Get a handle for the input method manager.
-        val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
+                // 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!!
 
-        // Hide the keyboard.
-        inputMethodManager.hideSoftInputFromWindow(toolbar.windowToken, 0)
-    }
+                    // Get the tab views.
+                    val tabFavoriteIconImageView = tabCustomView.findViewById<ImageView>(R.id.favorite_icon_imageview)
+                    val tabTitleTextView = tabCustomView.findViewById<TextView>(R.id.title_textview)
 
-    override fun onApplyNewFontSize(dialogFragment: DialogFragment) {
-        // Get the dialog.
-        val dialog = dialogFragment.dialog!!
+                    // Set the default favorite icon as the favorite icon for this tab.
+                    tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(nestedScrollWebView.getFavoriteIcon(), 64, 64, true))
 
-        // Get a handle for the font size edit text.
-        val fontSizeEditText = dialog.findViewById<EditText>(R.id.font_size_edittext)
+                    // Set the loading title text.
+                    tabTitleTextView.setText(R.string.loading)
+                }
+            }
 
-        // Initialize the new font size variable with the current font size.
-        var newFontSize = currentWebView!!.settings.textZoom
+            // Initialize the domain name in database variable.
+            var domainNameInDatabase: String? = null
 
-        // 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.
-        }
+            // 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
 
-        // Apply the new font size.
-        currentWebView!!.settings.textZoom = newFontSize
-    }
+                // 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
+            }
 
-    override fun onOpen(dialogFragment: DialogFragment) {
-        // Get the dialog.
-        val dialog = dialogFragment.dialog!!
+            // 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
 
-        // Get handles for the views.
-        val fileNameEditText = dialog.findViewById<EditText>(R.id.file_name_edittext)
-        val mhtCheckBox = dialog.findViewById<CheckBox>(R.id.mht_checkbox)
+                    // Store the applied domain names as it appears in the database.
+                    domainNameInDatabase = "*.$newHostName"
+                }
 
-        // Get the file path string.
-        val openFilePath = fileNameEditText.text.toString()
+                // Strip out the lowest subdomain of of the host name.
+                newHostName = newHostName.substring(newHostName.indexOf(".") + 1)
+            }
 
-        // Apply the domain settings.  This resets the favorite icon and removes any domain settings.
-        applyDomainSettings(currentWebView!!, openFilePath, resetTab = true, reloadWebsite = false, loadUrl = false)
+            // 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!!)
 
-        // 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))
+                // Move to the first position.
+                currentDomainSettingsCursor.moveToFirst()
 
-                // Create a temporary MHT file.
-                val temporaryMhtFile = File.createTempFile(TEMPORARY_MHT_FILE, ".mht", cacheDir)
+                // 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 formDataInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndexOrThrow(ENABLE_FORM_DATA))  // Form data can be removed once the minimum API >= 26.
+                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))
 
-                // Get a file output stream for the temporary MHT file.
-                val temporaryMhtFileOutputStream = FileOutputStream(temporaryMhtFile)
+                // Close the current host domain settings cursor.
+                currentDomainSettingsCursor.close()
 
-                // Create a transfer byte array.
-                val transferByteArray = ByteArray(1024)
+                // Set the JavaScript status.
+                when (javaScriptInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.javaScriptEnabled = defaultJavaScript
+                    ENABLED -> nestedScrollWebView.settings.javaScriptEnabled = true
+                    DISABLED -> nestedScrollWebView.settings.javaScriptEnabled = false
+                }
 
-                // Create an integer to track the number of bytes read.
-                var bytesRead: Int
+                // Store the cookies status.
+                when (cookiesInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.acceptCookies = defaultCookies
+                    ENABLED -> nestedScrollWebView.acceptCookies = true
+                    DISABLED -> nestedScrollWebView.acceptCookies = false
+                }
 
-                // 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)
+                // Apply the cookies status.
+                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
 
-                // Flush the temporary MHT file output stream.
-                temporaryMhtFileOutputStream.flush()
+                // Set the DOM storage status.
+                when (domStorageInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.domStorageEnabled = defaultDomStorage
+                    ENABLED -> nestedScrollWebView.settings.domStorageEnabled = true
+                    DISABLED -> nestedScrollWebView.settings.domStorageEnabled = false
+                }
 
-                // Close the streams.
-                temporaryMhtFileOutputStream.close()
-                mhtFileInputStream.close()
+                // Apply the form data setting if the API < 26.
+                @Suppress("DEPRECATION")
+                if (Build.VERSION.SDK_INT < 26) {
+                    // Set the form data status.
+                    when (formDataInt) {
+                        SYSTEM_DEFAULT -> nestedScrollWebView.settings.saveFormData = defaultFormData
+                        ENABLED -> nestedScrollWebView.settings.saveFormData = true
+                        DISABLED -> nestedScrollWebView.settings.saveFormData = false
+                    }
+                }
 
-                // 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)
-        }
-    }
-
-    private fun downloadUrlWithExternalApp(url: String) {
-        // Create a download intent.  Not specifying the action type will display the maximum number of options.
-        val downloadIntent = Intent()
-
-        // Set the URI and the mime type.
-        downloadIntent.setDataAndType(Uri.parse(url), "text/html")
+                // Set the EasyList status.
+                when (easyListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.easyListEnabled = defaultEasyList
+                    ENABLED -> nestedScrollWebView.easyListEnabled = true
+                    DISABLED -> nestedScrollWebView.easyListEnabled = false
+                }
 
-        // Flag the intent to open in a new task.
-        downloadIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                // Set the EasyPrivacy status.
+                when (easyPrivacyInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.easyPrivacyEnabled = defaultEasyPrivacy
+                    ENABLED -> nestedScrollWebView.easyPrivacyEnabled = true
+                    DISABLED -> nestedScrollWebView.easyPrivacyEnabled = false
+                }
 
-        // Show the chooser.
-        startActivity(Intent.createChooser(downloadIntent, getString(R.string.download_with_external_app)))
-    }
+                // Set the Fanboy's Annoyance List status.
+                when (fanboysAnnoyanceListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.fanboysAnnoyanceListEnabled = defaultFanboysAnnoyanceList
+                    ENABLED -> nestedScrollWebView.fanboysAnnoyanceListEnabled = true
+                    DISABLED -> nestedScrollWebView.fanboysAnnoyanceListEnabled = false
+                }
 
-    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 Fanboy's Social Blocking List status.
+                when (fanboysSocialBlockingListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.fanboysSocialBlockingListEnabled = defaultFanboysSocialBlockingList
+                    ENABLED -> nestedScrollWebView.fanboysSocialBlockingListEnabled = true
+                    DISABLED -> nestedScrollWebView.fanboysSocialBlockingListEnabled = false
+                }
 
-            // Get a handle for the dialog URL edit text.
-            val dialogUrlEditText = dialog.findViewById<EditText>(R.id.url_edittext)
+                // Set the UltraList status.
+                when (ultraListInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.ultraListEnabled = defaultUltraList
+                    ENABLED -> nestedScrollWebView.ultraListEnabled = true
+                    DISABLED -> nestedScrollWebView.ultraListEnabled = false
+                }
 
-            // Get the URL from the edit text, which may have been modified.
-            dialogUrlEditText.text.toString()
-        }
+                // Set the UltraPrivacy status.
+                when (ultraPrivacyInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.ultraPrivacyEnabled = defaultUltraPrivacy
+                    ENABLED -> nestedScrollWebView.ultraPrivacyEnabled = true
+                    DISABLED -> nestedScrollWebView.ultraPrivacyEnabled = false
+                }
 
-        // Open the file picker.
-        saveUrlActivityResultLauncher.launch(fileNameString)
-    }
+                // Set the block all third-party requests status.
+                when (blockAllThirdPartyRequestsInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.blockAllThirdPartyRequests = defaultBlockAllThirdPartyRequests
+                    ENABLED -> nestedScrollWebView.blockAllThirdPartyRequests = true
+                    DISABLED -> nestedScrollWebView.blockAllThirdPartyRequests = 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 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
 
-        // 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 user agent to `""`, which uses the default value.
+                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT -> nestedScrollWebView.settings.userAgentString = ""
 
-        // 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 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))
 
-                // Reapply the syntax highlighting.
-                UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
-            }
-        }
+                        // 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
 
-        // 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 user agent to `""`, which uses the default value.
+                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT ->
+                            nestedScrollWebView.settings.userAgentString = ""
 
-                // Consume the event.
-                return@setOnKeyListener true
-            } else {  // Some other key was pressed.
-                // Do not consume the event.
-                return@setOnKeyListener false
-            }
-        }
+                        // Get the user agent string from the user agent data array.
+                        else ->
+                            nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
+                    }
+                }
 
-        // 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")!!
+                // 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
+                }
 
-                // 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 swipe to refresh.
+                when (swipeToRefreshInt) {
+                    SYSTEM_DEFAULT -> {
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.swipeToRefresh = defaultSwipeToRefresh
 
-                    // Get a list of the current fragments.
-                    val fragmentList = supportFragmentManager.fragments
+                        // 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
+                        }
+                    }
 
-                    // 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
+                    ENABLED -> {
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.swipeToRefresh = true
 
-                        // 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()
+                        // 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)
                         }
                     }
 
-                    // 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)
+                    DISABLED -> {
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.swipeToRefresh = false
 
-                        // Get the fragment view.
-                        val fragmentView = webViewTabFragment.view
+                        // Disable swipe to refresh.
+                        swipeRefreshLayout.isEnabled = false
+                    }
+                }
 
-                        // 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)
+                // Set the WebView theme if algorithmic darkening is supported.
+                if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
+                    // Set the WebView theme.
+                    when (webViewThemeInt) {
+                        // Set the WebView theme.
+                        SYSTEM_DEFAULT ->
+                            when (defaultWebViewTheme) {
+                                // The light theme is selected.  Turn off algorithmic darkening.
+                                webViewThemeEntryValuesStringArray[1] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
 
-                            // Get the waiting for proxy URL string.
-                            val waitingForProxyUrlString = nestedScrollWebView.waitingForProxyUrlString
+                                // The dark theme is selected.  Turn on algorithmic darkening.
+                                webViewThemeEntryValuesStringArray[2] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
 
-                            // Load the pending URL if it exists.
-                            if (waitingForProxyUrlString.isNotEmpty()) {  // A URL is waiting to be loaded.
-                                // Load the URL.
-                                loadUrl(nestedScrollWebView, waitingForProxyUrlString)
+                                // The system default theme is selected.
+                                else -> {
+                                    // Get the current system theme status.
+                                    val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
 
-                                // Reset the waiting for proxy URL string.
-                                nestedScrollWebView.waitingForProxyUrlString = ""
-                            } else {  // No URL is waiting to be loaded.
-                                // Reload the existing URL.
-                                nestedScrollWebView.reload()
+                                    // Set the algorithmic darkening according to the current system theme status.
+                                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
+                                }
                             }
-                        }
+
+                        // Turn off algorithmic darkening.
+                        LIGHT_THEME -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
+
+                        // Turn on algorithmic darkening.
+                        DARK_THEME -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
                     }
                 }
-            }
-        }
 
-        // Register the Orbot status broadcast receiver.
-        registerReceiver(orbotStatusBroadcastReceiver, IntentFilter("org.torproject.android.intent.action.STATUS"))
+                // Set the wide viewport status.
+                when (wideViewportInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.useWideViewPort = defaultWideViewport
+                    ENABLED -> nestedScrollWebView.settings.useWideViewPort = true
+                    DISABLED -> nestedScrollWebView.settings.useWideViewPort = false
+                }
 
-        // 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)
+                // Set the display webpage images status.
+                when (displayWebpageImagesInt) {
+                    SYSTEM_DEFAULT -> nestedScrollWebView.settings.loadsImagesAutomatically = defaultDisplayWebpageImages
+                    ENABLED -> nestedScrollWebView.settings.loadsImagesAutomatically = true
+                    DISABLED -> nestedScrollWebView.settings.loadsImagesAutomatically = false
+                }
 
-        // Update the WebView pager every time a tab is modified.
-        webViewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
-            override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}
+                // If there is a pinned SSL certificate, store it in the WebView.
+                if (pinnedSslCertificate)
+                    nestedScrollWebView.setPinnedSslCertificate(pinnedSslIssuedToCName, pinnedSslIssuedToOName, pinnedSslIssuedToUName, pinnedSslIssuedByCName, pinnedSslIssuedByOName, pinnedSslIssuedByUName,
+                        pinnedSslStartDate, pinnedSslEndDate)
 
-            override fun onPageSelected(position: Int) {
-                // Close the find on page bar if it is open.
-                closeFindOnPage(null)
+                // If there is a pinned IP address, store it in the WebView.
+                if (pinnedIpAddresses)
+                    nestedScrollWebView.pinnedIpAddresses = pinnedHostIpAddresses
 
-                // Set the current WebView.
-                setCurrentWebView(position)
+                // 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
 
-                // 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)!!
+                // Apply the default cookie setting.
+                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
 
-                        // Select the tab.
-                        tab.select()
-                    }
+                // Apply the form data setting if the API < 26.
+                if (Build.VERSION.SDK_INT < 26)
+                    @Suppress("DEPRECATION")
+                    nestedScrollWebView.settings.saveFormData = defaultFormData
+
+                // 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
                 }
-            }
 
-            override fun onPageScrollStateChanged(state: Int) {}
-        })
+                // Store the swipe to refresh status in the nested scroll WebView.
+                nestedScrollWebView.swipeToRefresh = defaultSwipeToRefresh
 
-        // 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
-            }
+                // 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 onTabUnselected(tab: TabLayout.Tab) {}
+                // Reset the domain settings database ID.
+                nestedScrollWebView.domainSettingsDatabaseId = -1
 
-            override fun onTabReselected(tab: TabLayout.Tab) {
-                // Instantiate the View SSL Certificate dialog.
-                val viewSslCertificateDialogFragment: DialogFragment = ViewSslCertificateDialog.displayDialog(currentWebView!!.webViewFragmentId, currentWebView!!.getFavoriteIcon())
+                // 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
 
-                // Display the View SSL Certificate dialog.
-                viewSslCertificateDialogFragment.show(supportFragmentManager, getString(R.string.view_ssl_certificate))
-            }
-        })
+                    // Set the user agent to `""`, which uses the default value.
+                    SETTINGS_WEBVIEW_DEFAULT_USER_AGENT -> nestedScrollWebView.settings.userAgentString = ""
 
-        // 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 }
+                    // 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))
 
-        // 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()
+                    // Get the user agent string from the user agent data array
+                    else -> nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
+                }
 
-            // Create a favorite icon byte array output stream.
-            val currentFavoriteIconByteArrayOutputStream = ByteArrayOutputStream()
+                // Set the WebView theme if algorithmic darkening is supported.
+                if (WebViewFeature.isFeatureSupported(WebViewFeature.ALGORITHMIC_DARKENING)) {
+                    // Set the WebView theme.
+                    when (defaultWebViewTheme) {
+                        // The light theme is selected.  Turn off algorithmic darkening.
+                        webViewThemeEntryValuesStringArray[1] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, 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)
+                        // The dark theme is selected.  Turn on algorithmic darkening.
+                        webViewThemeEntryValuesStringArray[2] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
 
-            // Convert the favorite icon byte array stream to a byte array.
-            val currentFavoriteIconByteArray = currentFavoriteIconByteArrayOutputStream.toByteArray()
+                        // 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
 
-            // Create an intent to launch the bookmarks activity.
-            val bookmarksIntent = Intent(applicationContext, BookmarksActivity::class.java)
+                            // Set the algorithmic darkening according to the current system theme status.
+                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
+                        }
+                    }
+                }
 
-            // 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)
+                // Set the viewport.
+                nestedScrollWebView.settings.useWideViewPort = defaultWideViewport
 
-            // Make it so.
-            startActivity(bookmarksIntent)
-        }
+                // Set the loading of webpage images.
+                nestedScrollWebView.settings.loadsImagesAutomatically = defaultDisplayWebpageImages
 
-        // 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 a transparent background on the URL relative layout.
+                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.color.transparent)
+            }
 
-            // Show the create bookmark folder dialog.
-            createBookmarkFolderDialog.show(supportFragmentManager, getString(R.string.create_folder))
+            // Update the privacy icons.
+            updatePrivacyIcons(true)
         }
 
-        // 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())
+        // Reload the website if returning from the Domains activity.
+        if (reloadWebsite)
+            nestedScrollWebView.reload()
 
-            // Display the create bookmark dialog.
-            createBookmarkDialog.show(supportFragmentManager, getString(R.string.create_bookmark))
-        }
+        // Disable the wide viewport if the source is being viewed.
+        if (url.startsWith("view-source:"))
+            nestedScrollWebView.settings.useWideViewPort = false
 
-        // 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) {}
+        // 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)
+    }
 
-            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
+    private fun applyProxy(reloadWebViews: Boolean) {
+        // Set the proxy according to the mode.
+        proxyHelper.setProxy(applicationContext, appBarLayout, proxyMode)
 
-            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())
-            }
-        })
+        // Reset the waiting for proxy tracker.
+        waitingForProxy = false
 
-        // 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 proxy.
+        when (proxyMode) {
+            ProxyHelper.NONE -> {
+                // Initialize a color background typed value.
+                val colorBackgroundTypedValue = TypedValue()
 
-                // Consume the event.
-                return@setOnKeyListener true
-            } else {  // A different key was pressed.
-                // Do not consume the event.
-                return@setOnKeyListener false
+                // Get the color background from the theme.
+                theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
+
+                // Get the color background int from the typed value.
+                val colorBackgroundInt = colorBackgroundTypedValue.data
+
+                // Set the default app bar layout background.
+                appBarLayout.setBackgroundColor(colorBackgroundInt)
             }
-        }
 
-        // Implement swipe to refresh.
-        swipeRefreshLayout.setOnRefreshListener {
-            // Reload the website.
-            currentWebView!!.reload()
-        }
+            ProxyHelper.TOR -> {
+                // Set the app bar background to indicate proxying is enabled.
+                appBarLayout.setBackgroundResource(R.color.blue_background)
 
-        // Store the default progress view offsets.
-        defaultProgressViewStartOffset = swipeRefreshLayout.progressViewStartOffset
-        defaultProgressViewEndOffset = swipeRefreshLayout.progressViewEndOffset
+                // Check to see if Orbot is installed.
+                try {
+                    // Get the package manager.
+                    val packageManager = packageManager
 
-        // Set the refresh color scheme according to the theme.
-        swipeRefreshLayout.setColorSchemeResources(R.color.blue_text)
+                    // 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)
 
-        // Initialize a color background typed value.
-        val colorBackgroundTypedValue = TypedValue()
+                    // 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 the color background from the theme.
-        theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
+                        // 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()
 
-        // Get the color background int from the typed value.
-        val colorBackgroundInt = colorBackgroundTypedValue.data
+                            // 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)
 
-        // Set the swipe refresh background color.
-        swipeRefreshLayout.setProgressBackgroundColorSchemeColor(colorBackgroundInt)
+                        // 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)))
+                        }
+                    }
+                }
+            }
 
-        // 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))
+            ProxyHelper.I2P -> {
+                // Set the app bar background to indicate proxying is enabled.
+                appBarLayout.setBackgroundResource(R.color.blue_background)
 
-        // Load the bookmarks folder.
-        loadBookmarksFolder()
+                // 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)
 
-        // 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()
+                            // 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 bookmark cursor for this ID.
-            val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
+            ProxyHelper.CUSTOM ->
+                // Set the app bar background to indicate proxying is enabled.
+                appBarLayout.setBackgroundResource(R.color.blue_background)
+        }
 
-            // Move the bookmark cursor to the first row.
-            bookmarkCursor.moveToFirst()
+        // 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)
 
-            // 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 fragment view.
+                val fragmentView = webViewTabFragment.view
 
-                // 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)))
+                // 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)
 
-                // Close the bookmarks drawer if it is not pinned.
-                if (!bookmarksDrawerPinned)
-                    drawerLayout.closeDrawer(GravityCompat.END)
+                    // Reload the WebView.
+                    nestedScrollWebView.reload()
+                }
             }
+        }
+    }
 
-            // Close the cursor.
-            bookmarkCursor.close()
+    // 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)
+
+            // Load the new folder.
+            loadBookmarksFolder()
         }
+    }
 
-        // 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()
+    private fun clearAndExit() {
+        // Close the bookmarks cursor if it exists.
+        bookmarksCursor?.close()
 
-            // 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)
+        // Close the databases helpers if they exist.
+        bookmarksDatabaseHelper?.close()
+        domainsDatabaseHelper?.close()
 
-                // Move to the first entry in the cursor.
-                bookmarksCursor.moveToFirst()
+        // Get the status of the clear everything preference.
+        val clearEverything = sharedPreferences.getBoolean(getString(R.string.clear_everything_key), 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))
+        // Get a handle for the runtime.
+        val runtime = Runtime.getRuntime()
 
-                    // Move to the next bookmark.
-                    bookmarksCursor.moveToNext()
-                }
+        // 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
 
-                // Close the cursor.
-                bookmarksCursor.close()
-            } else {  // The bookmark is not a folder.
-                // Get the bookmark cursor for this ID.
-                val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
+        // 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)
 
-                // Move the bookmark cursor to the first row.
-                bookmarkCursor.moveToFirst()
+            // Ask the cookie manager to flush the cookie database.
+            cookieManager.flush()
 
-                // 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)
+            // 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")
 
-                // Close the cursor.
-                bookmarkCursor.close()
+                // Wait until the processes have finished.
+                deleteCookiesProcess.waitFor()
+                deleteCookiesJournalProcess.waitFor()
+            } catch (exception: Exception) {
+                // Do nothing if an error is thrown.
             }
+        }
 
-            // Close the bookmarks drawer if it is not pinned.
-            if (!bookmarksDrawerPinned)
-                drawerLayout.closeDrawer(GravityCompat.END)
+        // 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()
 
-            // Consume the event.
-            true
+            // 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/"))
+
+                // 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")
+
+                // 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.
+            }
         }
 
-        // The drawer listener is used to update the navigation menu.
-        drawerLayout.addDrawerListener(object : DrawerLayout.DrawerListener {
-            override fun onDrawerSlide(drawerView: View, slideOffset: Float) {}
+        // 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()
 
-            override fun onDrawerOpened(drawerView: View) {}
+            // 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"))
 
-            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()
+                // Wait until the processes have finished.
+                deleteWebDataProcess.waitFor()
+                deleteWebDataJournalProcess.waitFor()
+            } catch (exception: Exception) {
+                // Do nothing if an error is thrown.
             }
+        }
 
-            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)
+        // 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")
 
-                        // Hide the keyboard (if displayed).
-                        inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
-                    }
+                // Wait for the process to finish.
+                process.waitFor()
+            } catch (exception: IOException) {
+                // Do nothing.
+            } catch (exception: InterruptedException) {
+                // Do nothing.
+            }
+        }
 
-                    // 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()
+        // 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 = webViewStateAdapter!!.getPageFragment(i)
 
-                    // 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()
+                // Get the WebView fragment view.
+                val webViewFragmentView = webViewTabFragment.view
+
+                // 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)
+
+                    // Clear the cache for this WebView.
+                    nestedScrollWebView.clearCache(true)
                 }
             }
-        })
 
-        // 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)
+            // Manually delete the cache directories.
+            try {
+                // Delete the main cache directory.
+                val deleteCacheProcess = runtime.exec("rm -rf $privateDataDirectoryString/cache")
 
-        // Get a handle for the WebView.
-        val bareWebView = webViewLayout.findViewById<WebView>(R.id.bare_webview)
+                // 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/"))
 
-        // Store the default user agent.
-        webViewDefaultUserAgent = bareWebView.settings.userAgentString
+                // Wait until the processes have finished.
+                deleteCacheProcess.waitFor()
+                deleteServiceWorkerProcess.waitFor()
+            } catch (exception: Exception) {
+                // Do nothing if an error is thrown.
+            }
+        }
 
-        // Destroy the bare WebView.
-        bareWebView.destroy()
+        // Wipe out each WebView.
+        for (i in 0 until webViewStateAdapter!!.itemCount) {
+            // Get the WebView tab fragment.
+            val webViewTabFragment = webViewStateAdapter!!.getPageFragment(i)
 
-        // Update the domains settings set.
-        updateDomainsSettingsSet()
-    }
+            // Get the WebView frame layout.
+            val webViewFrameLayout = webViewTabFragment.view as FrameLayout?
 
-    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)
+            // 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)
 
-        // Apply the saved proxy mode if the app has been restarted.
-        if (savedProxyMode != null) {
-            // Apply the saved proxy mode.
-            proxyMode = savedProxyMode!!
+                // Clear SSL certificate preferences for this WebView.
+                nestedScrollWebView.clearSslPreferences()
 
-            // Reset the saved proxy mode.
-            savedProxyMode = null
-        }
+                // Clear the back/forward history for this WebView.
+                nestedScrollWebView.clearHistory()
 
-        // Get the search string.
-        val searchString = sharedPreferences.getString(getString(R.string.search_key), getString(R.string.search_default_value))!!
+                // Remove all the views from the frame layout.
+                webViewFrameLayout.removeAllViews()
 
-        // 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
+                // Destroy the internal state of the WebView.
+                nestedScrollWebView.destroy()
+            }
+        }
 
-        // Apply the proxy.
-        applyProxy(false)
+        // 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")
 
-        // 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 process has finished.
+                deleteAppWebviewProcess.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)
+        // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
+        finishAndRemoveTask()
 
-                    // 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
+        // Remove the terminated program from RAM.  The status code is `0`.
+        exitProcess(0)
+    }
 
-            // 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
+    // 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
 
-                // Expand the app bar if it is currently collapsed.
-                appBarLayout.setExpanded(true)
-            }
+        // Clear the highlighted phrases if the WebView is not null.
+        currentWebView?.clearMatches()
 
-            // Set the app bar scrolling for each WebView.
-            for (i in 0 until webViewPagerAdapter!!.count) {
-                // Get the WebView tab fragment.
-                val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
+        // Hide the find on page linear layout.
+        findOnPageLinearLayout.visibility = View.GONE
 
-                // Get the fragment view.
-                val fragmentView = webViewTabFragment.view
+        // Show the toolbar.
+        toolbar.visibility = View.VISIBLE
 
-                // 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)
+        // Get a handle for the input method manager.
+        val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
 
-                    // Set the app bar scrolling.
-                    nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
-                }
-            }
+        // Hide the keyboard.
+        inputMethodManager.hideSoftInputFromWindow(toolbar.windowToken, 0)
+    }
+
+    // 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()
         }
+    }
 
-        // 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
+    override fun createBookmark(dialogFragment: DialogFragment, favoriteIconBitmap: Bitmap) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
 
-                // Hide the app bar.
-                appBar.hide()
-            } else {
-                // Show the tab linear layout.
-                tabsLinearLayout.visibility = View.VISIBLE
+        // 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)
 
-                // Show the app bar.
-                appBar.show()
-            }
+        // Extract the strings from the edit texts.
+        val bookmarkNameString = createBookmarkNameEditText.text.toString()
+        val bookmarkUrlString = createBookmarkUrlEditText.text.toString()
 
-            /* 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.
-             */
+        // Create a favorite icon byte array output stream.
+        val favoriteIconByteArrayOutputStream = ByteArrayOutputStream()
 
-            // 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
+        // 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)
 
-            // Show the tab linear layout.
-            tabsLinearLayout.visibility = View.VISIBLE
+        // Convert the favorite icon byte array stream to a byte array.
+        val favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray()
 
-            // Show the app bar.
-            appBar.show()
+        // Display the new bookmark below the current items in the (0 indexed) list.
+        val newBookmarkDisplayOrder = bookmarksListView.count
 
-            // 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
-        }
-    }
+        // Create the bookmark.
+        bookmarksDatabaseHelper!!.createBookmark(bookmarkNameString, bookmarkUrlString, currentBookmarksFolderId, newBookmarkDisplayOrder, favoriteIconByteArray)
 
-    override fun navigateHistory(url: String, steps: Int) {
-        // Apply the domain settings.
-        applyDomainSettings(currentWebView!!, url, resetTab = false, reloadWebsite = false, loadUrl = false)
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolderId)
 
-        // Load the history entry.
-        currentWebView!!.goBackOrForward(steps)
+        // Update the list view.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
+
+        // Scroll to the new bookmark.
+        bookmarksListView.setSelection(newBookmarkDisplayOrder)
     }
 
-    override fun pinnedErrorGoBack() {
-        // Get the current web back forward list.
-        val webBackForwardList = currentWebView!!.copyBackForwardList()
+    override fun createBookmarkFolder(dialogFragment: DialogFragment, favoriteIconBitmap: Bitmap) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
 
-        // Get the previous entry URL.
-        val previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.currentIndex - 1).url
+        // 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)
 
-        // Apply the domain settings.
-        applyDomainSettings(currentWebView!!, previousUrl, resetTab = false, reloadWebsite = false, loadUrl = false)
+        // Get new folder name string.
+        val folderNameString = folderNameEditText.text.toString()
 
-        // Go back.
-        currentWebView!!.goBack()
-    }
+        // 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
 
-    // `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!!
+            // Convert the folder icon drawable to a bitmap drawable.
+            val folderIconBitmapDrawable = folderIconDrawable as BitmapDrawable
 
-        // Parse the URL into a URI.
-        val uri = Uri.parse(url)
+            // 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
+        }
 
-        // Extract the domain from the URI.
-        var newHostName = uri.host
+        // Create a folder icon byte array output stream.
+        val folderIconByteArrayOutputStream = ByteArrayOutputStream()
 
-        // Strings don't like to be null.
-        if (newHostName == null)
-            newHostName = ""
+        // 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)
 
-        // 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
+        // Convert the folder icon byte array stream to a byte array.
+        val folderIconByteArray = folderIconByteArrayOutputStream.toByteArray()
 
-            // Reset the ignoring of pinned domain information.
-            nestedScrollWebView.ignorePinnedDomainInformation = false
+        // 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()
 
-            // Clear any pinned SSL certificate or IP addresses.
-            nestedScrollWebView.clearPinnedSslCertificate()
-            nestedScrollWebView.pinnedIpAddresses = ""
+            // Move the bookmark down one slot.
+            bookmarksDatabaseHelper!!.updateDisplayOrder(databaseId, i + 1)
+        }
 
-            // Reset the favorite icon if specified.
-            if (resetTab) {
-                // Initialize the favorite icon.
-                nestedScrollWebView.initializeFavoriteIcon()
+        // Create the folder, which will be placed at the top of the list view.
+        bookmarksDatabaseHelper!!.createFolder(folderNameString, currentBookmarksFolderId, folderIconByteArray)
 
-                // Get the current page position.
-                val currentPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolderId)
 
-                // Get the corresponding tab.
-                val tab = tabLayout.getTabAt(currentPagePosition)
+        // Update the list view.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor)
 
-                // 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!!
+        // Scroll to the new folder.
+        bookmarksListView.setSelection(0)
+    }
 
-                    // Get the tab views.
-                    val tabFavoriteIconImageView = tabCustomView.findViewById<ImageView>(R.id.favorite_icon_imageview)
-                    val tabTitleTextView = tabCustomView.findViewById<TextView>(R.id.title_textview)
+    private fun downloadUrlWithExternalApp(url: String) {
+        // Create a download intent.  Not specifying the action type will display the maximum number of options.
+        val downloadIntent = Intent()
 
-                    // Set the default favorite icon as the favorite icon for this tab.
-                    tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(nestedScrollWebView.getFavoriteIcon(), 64, 64, true))
+        // Set the URI and the mime type.
+        downloadIntent.setDataAndType(Uri.parse(url), "text/html")
 
-                    // Set the loading title text.
-                    tabTitleTextView.setText(R.string.loading)
-                }
-            }
+        // Flag the intent to open in a new task.
+        downloadIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-            // Initialize the domain name in database variable.
-            var domainNameInDatabase: String? = null
+        // Show the chooser.
+        startActivity(Intent.createChooser(downloadIntent, getString(R.string.download_with_external_app)))
+    }
 
-            // 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
+    private fun exitFullScreenVideo() {
+        // Re-enable the screen timeout.
+        fullScreenVideoFrameLayout.keepScreenOn = false
 
-                // 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
-            }
+        // Unset the full screen video flag.
+        displayingFullScreenVideo = false
 
-            // 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
+        // Remove all the views from the full screen video frame layout.
+        fullScreenVideoFrameLayout.removeAllViews()
 
-                    // Store the applied domain names as it appears in the database.
-                    domainNameInDatabase = "*.$newHostName"
-                }
+        // Hide the full screen video frame layout.
+        fullScreenVideoFrameLayout.visibility = View.GONE
 
-                // Strip out the lowest subdomain of of the host name.
-                newHostName = newHostName.substring(newHostName.indexOf(".") + 1)
-            }
+        // Enable the sliding drawers.
+        drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
 
-            // 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)
+        // Show the coordinator layout.
+        coordinatorLayout.visibility = View.VISIBLE
 
-            // Get the WebView theme entry values string array.
-            val webViewThemeEntryValuesStringArray = resources.getStringArray(R.array.webview_theme_entry_values)
+        // 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
 
-            // 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)
+                // Hide the app bar.
+                appBar.hide()
+            }
 
-            // 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!!)
+            /* 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.
+             */
 
-                // Move to the first position.
-                currentDomainSettingsCursor.moveToFirst()
+            // 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 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))
+    // 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)
+    }
 
-                // Close the current host domain settings cursor.
-                currentDomainSettingsCursor.close()
+    // 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)
+    }
 
-                // If there is a pinned SSL certificate, store it in the WebView.
-                if (pinnedSslCertificate)
-                    nestedScrollWebView.setPinnedSslCertificate(pinnedSslIssuedToCName, pinnedSslIssuedToOName, pinnedSslIssuedToUName, pinnedSslIssuedByCName, pinnedSslIssuedByOName, pinnedSslIssuedByUName,
-                        pinnedSslStartDate, pinnedSslEndDate)
+    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]
 
-                // If there is a pinned IP address, store it in the WebView.
-                if (pinnedIpAddresses)
-                    nestedScrollWebView.pinnedIpAddresses = pinnedHostIpAddresses
+        // 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("", false)
+        } else {  // The activity has been restarted.
+            // Restore each tab.
+            for (i in savedStateArrayList!!.indices) {
+                // Add a new tab.
+                tabLayout.addTab(tabLayout.newTab())
 
-                // Apply the cookie domain settings.
-                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
+                // Get the new tab.
+                val newTab = tabLayout.getTabAt(i)!!
 
-                // Apply the form data setting if the API < 26.
-                @Suppress("DEPRECATION")
-                if (Build.VERSION.SDK_INT < 26)
-                    nestedScrollWebView.settings.saveFormData = saveFormData
+                // Set a custom view on the new tab.
+                newTab.setCustomView(R.layout.tab_custom_view)
 
-                // 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
-                }
+                // Add the new page.
+                webViewStateAdapter!!.restorePage(savedStateArrayList!![i], savedNestedScrollWebViewStateArrayList!![i])
+            }
 
-                // 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
+            // Reset the saved state variables.
+            savedStateArrayList = null
+            savedNestedScrollWebViewStateArrayList = null
 
-                        // Set the user agent to `""`, which uses the default value.
-                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT -> nestedScrollWebView.settings.userAgentString = ""
+            // 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.
+                // Switch to the page before the saved tab position.
+                webViewViewPager2.post { webViewViewPager2.currentItem = (savedTabPosition - 1) }
 
-                        // 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))
+                // Switch to the saved tab position.
+                // This has to be done twice because, for some reason, if the above step is skipped there is some race condition where nothing happens and the first page is displayed.
+                webViewViewPager2.post { webViewViewPager2.currentItem = savedTabPosition }
+            }
 
-                        // 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
+            // Get the intent that started the app.
+            val intent = intent
 
-                        // Set the user agent to `""`, which uses the default value.
-                        SETTINGS_WEBVIEW_DEFAULT_USER_AGENT ->
-                            nestedScrollWebView.settings.userAgentString = ""
+            // Reset the intent.  This prevents a duplicate tab from being created on restart.
+            setIntent(Intent())
 
-                        // Get the user agent string from the user agent data array.
-                        else ->
-                            nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
-                    }
-                }
+            // Get the information from the intent.
+            val intentAction = intent.action
+            val intentUriData = intent.data
+            val intentStringExtra = intent.getStringExtra(Intent.EXTRA_TEXT)
 
-                // Set swipe to refresh.
-                when (swipeToRefreshInt) {
-                    DomainsDatabaseHelper.SYSTEM_DEFAULT -> {
-                        // 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)
-                            }
-                        } else {  // Swipe to refresh is disabled.
-                            // Disable the swipe refresh layout.
-                            swipeRefreshLayout.isEnabled = false
-                        }
+            // 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) {
+                        ""
                     }
 
-                    DomainsDatabaseHelper.ENABLED -> {
-                        // Store the swipe to refresh status in the nested scroll WebView.
-                        nestedScrollWebView.swipeToRefresh = true
-
-                        // 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)
-                        }
-                    }
+                    // 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!!
+                }
 
-                    DomainsDatabaseHelper.DISABLED -> {
-                        // Store the swipe to refresh status in the nested scroll WebView.
-                        nestedScrollWebView.swipeToRefresh = false
+                // 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
 
-                        // Disable swipe to refresh.
-                        swipeRefreshLayout.isEnabled = false
-                    }
+                    // Add a new tab.
+                    addNewTab(urlString, true)
+                } else {  // Load the URL in the current tab.
+                    // Make it so.
+                    loadUrl(currentWebView!!, urlString)
                 }
+            }
+        }
+    }
 
-                // 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 dark theme is selected.  Turn on algorithmic darkening.
-                                webViewThemeEntryValuesStringArray[2] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+    // 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)
 
-                                // The system default theme is selected.
-                                else -> {
-                                    // Get the current system theme status.
-                                    val currentThemeStatus = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
+        // 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 algorithmic darkening according to the current system theme status.
-                                    WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
-                                }
-                            }
+        // 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)
 
-                        // Turn off algorithmic darkening.
-                        DomainsDatabaseHelper.LIGHT_THEME -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, false)
+                // Reapply the syntax highlighting.
+                UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
+            }
+        }
 
-                        // Turn on algorithmic darkening.
-                        DomainsDatabaseHelper.DARK_THEME -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
-                    }
-                }
+        // 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 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 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
-                }
-
-                // 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)
+                // Consume the event.
+                return@setOnKeyListener true
+            } else {  // Some other key was pressed.
+                // Do not consume the event.
+                return@setOnKeyListener false
+            }
+        }
 
-                // Apply the default cookie setting.
-                cookieManager.setAcceptCookie(nestedScrollWebView.acceptCookies)
+        // 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")!!
 
-                // 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
-                }
+                // 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
 
-                // Apply the form data setting if the API < 26.
-                if (Build.VERSION.SDK_INT < 26)
-                    @Suppress("DEPRECATION")
-                    nestedScrollWebView.settings.saveFormData = saveFormData
+                    // Get a list of the current fragments.
+                    val fragmentList = supportFragmentManager.fragments
 
-                // Store the swipe to refresh status in the nested scroll WebView.
-                nestedScrollWebView.swipeToRefresh = defaultSwipeToRefresh
+                    // 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
 
-                // 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
+                        // 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 {  // Swipe to refresh is disabled.
-                    // Disable the swipe refresh layout.
-                    swipeRefreshLayout.isEnabled = false
-                }
 
-                // Reset the domain settings database ID.
-                nestedScrollWebView.domainSettingsDatabaseId = -1
+                    // 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)
 
-                // 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
+                        // Get the fragment view.
+                        val fragmentView = webViewTabFragment.view
 
-                    // Set the user agent to `""`, which uses the default value.
-                    SETTINGS_WEBVIEW_DEFAULT_USER_AGENT -> nestedScrollWebView.settings.userAgentString = ""
+                        // 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)
 
-                    // 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 waiting for proxy URL string.
+                            val waitingForProxyUrlString = nestedScrollWebView.waitingForProxyUrlString
 
-                    // Get the user agent string from the user agent data array
-                    else -> nestedScrollWebView.settings.userAgentString = userAgentDataArray[userAgentArrayPosition]
+                            // 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()
+                            }
+                        }
+                    }
                 }
+            }
+        }
 
-                // 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)
+        // Register the Orbot status broadcast receiver.
+        registerReceiver(orbotStatusBroadcastReceiver, IntentFilter("org.torproject.android.intent.action.STATUS"))
 
-                        // The dark theme is selected.  Turn on algorithmic darkening.
-                        webViewThemeEntryValuesStringArray[2] -> WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, true)
+        // 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)
 
-                        // 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
+        // Update the WebView pager every time a tab is modified.
+        webViewViewPager2.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
+            override fun onPageSelected(position: Int) {
+                // Close the find on page bar if it is open.
+                closeFindOnPage(null)
 
-                            // Set the algorithmic darkening according to the current system theme status.
-                            WebSettingsCompat.setAlgorithmicDarkeningAllowed(nestedScrollWebView.settings, currentThemeStatus == Configuration.UI_MODE_NIGHT_YES)
-                        }
+                // Set the current WebView.
+                setCurrentWebView(position)
+
+                // 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)!!
+
+                        // Select the tab.
+                        tab.select()
                     }
                 }
+            }
+        })
 
-                // Set the viewport.
-                nestedScrollWebView.settings.useWideViewPort = wideViewport
+        // Handle tab selections.
+        tabLayout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
+            override fun onTabSelected(tab: TabLayout.Tab) {
+                // Select the same page in the view pager.
+                webViewViewPager2.currentItem = tab.position
+            }
 
-                // Set the loading of webpage images.
-                nestedScrollWebView.settings.loadsImagesAutomatically = displayWebpageImages
+            override fun onTabUnselected(tab: TabLayout.Tab) {}
 
-                // Set a transparent background on the URL relative layout.
-                urlRelativeLayout.background = AppCompatResources.getDrawable(this, R.color.transparent)
+            override fun onTabReselected(tab: TabLayout.Tab) {
+                // 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))
             }
+        })
 
-            // Update the privacy icons.
-            updatePrivacyIcons(true)
-        }
+        // 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 }
 
-        // Reload the website if returning from the Domains activity.
-        if (reloadWebsite)
-            nestedScrollWebView.reload()
+        // 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()
 
-        // 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)
-    }
+            // Create a favorite icon byte array output stream.
+            val currentFavoriteIconByteArrayOutputStream = ByteArrayOutputStream()
 
-    private fun applyProxy(reloadWebViews: Boolean) {
-        // Set the proxy according to the mode.
-        proxyHelper.setProxy(applicationContext, appBarLayout, proxyMode)
+            // 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)
 
-        // Reset the waiting for proxy tracker.
-        waitingForProxy = false
+            // Convert the favorite icon byte array stream to a byte array.
+            val currentFavoriteIconByteArray = currentFavoriteIconByteArrayOutputStream.toByteArray()
 
-        // Set the proxy.
-        when (proxyMode) {
-            ProxyHelper.NONE -> {
-                // Initialize a color background typed value.
-                val colorBackgroundTypedValue = TypedValue()
+            // Create an intent to launch the bookmarks activity.
+            val bookmarksIntent = Intent(applicationContext, BookmarksActivity::class.java)
 
-                // Get the color background from the theme.
-                theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
+            // 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)
 
-                // Get the color background int from the typed value.
-                val colorBackgroundInt = colorBackgroundTypedValue.data
+            // Make it so.
+            startActivity(bookmarksIntent)
+        }
 
-                // Set the default app bar layout background.
-                appBarLayout.setBackgroundColor(colorBackgroundInt)
-            }
+        // 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())
 
-            ProxyHelper.TOR -> {
-                // Set the app bar background to indicate proxying is enabled.
-                appBarLayout.setBackgroundResource(R.color.proxy_appbar_background)
+            // Show the create bookmark folder dialog.
+            createBookmarkFolderDialog.show(supportFragmentManager, getString(R.string.create_folder))
+        }
 
-                // Check to see if Orbot is installed.
-                try {
-                    // Get the package manager.
-                    val packageManager = packageManager
+        // 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())
 
-                    // 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)
+            // Display the create bookmark dialog.
+            createBookmarkDialog.show(supportFragmentManager, getString(R.string.create_bookmark))
+        }
 
-                    // 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
+        // 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) {}
 
-                        // 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()
+            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
 
-                            // 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)
+            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())
+            }
+        })
 
-                        // 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)))
-                        }
-                    }
-                }
-            }
-
-            ProxyHelper.I2P -> {
-                // Set the app bar background to indicate proxying is enabled.
-                appBarLayout.setBackgroundResource(R.color.proxy_appbar_background)
-
-                // 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)
+        // 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 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)))
-                            }
-                        }
-                    }
-                }
+                // Consume the event.
+                return@setOnKeyListener true
+            } else {  // A different key was pressed.
+                // Do not consume the event.
+                return@setOnKeyListener false
             }
-
-            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)
-
-                // Get the fragment view.
-                val fragmentView = webViewTabFragment.view
+        // Implement swipe to refresh.
+        swipeRefreshLayout.setOnRefreshListener {
+            // Reload the website.
+            currentWebView!!.reload()
+        }
 
-                // 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)
+        // Store the default progress view offsets.
+        defaultProgressViewStartOffset = swipeRefreshLayout.progressViewStartOffset
+        defaultProgressViewEndOffset = swipeRefreshLayout.progressViewEndOffset
 
-                    // Reload the WebView.
-                    nestedScrollWebView.reload()
-                }
-            }
-        }
-    }
+        // Set the refresh color scheme according to the theme.
+        swipeRefreshLayout.setColorSchemeResources(R.color.blue_text)
 
-    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)
+        // Initialize a color background typed value.
+        val colorBackgroundTypedValue = TypedValue()
 
-            // Update the cookies icon.
-            if (currentWebView!!.acceptCookies)
-                optionsCookiesMenuItem.setIcon(R.drawable.cookies_enabled)
-            else
-                optionsCookiesMenuItem.setIcon(R.drawable.cookies_disabled)
+        // Get the color background from the theme.
+        theme.resolveAttribute(android.R.attr.colorBackground, colorBackgroundTypedValue, true)
 
-            // 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)
+        // Get the color background int from the typed value.
+        val colorBackgroundInt = colorBackgroundTypedValue.data
 
-            // `invalidateOptionsMenu()` calls `onPrepareOptionsMenu()` and redraws the icons in the app bar.
-            if (runInvalidateOptionsMenu)
-                invalidateOptionsMenu()
-        }
-    }
+        // Set the swipe refresh background color.
+        swipeRefreshLayout.setProgressBackgroundColorSchemeColor(colorBackgroundInt)
 
-    private fun loadBookmarksFolder() {
-        // Update the bookmarks cursor with the contents of the bookmarks database for the current folder.
-        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolder)
+        // 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))
 
-        // 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)
-            }
+        // Load the bookmarks folder.
+        loadBookmarksFolder()
 
-            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)
+        // 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()
 
-                // Get the favorite icon byte array from the cursor.
-                val favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.FAVORITE_ICON))
+            // Get the bookmark cursor for this ID.
+            val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
 
-                // 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)
+            // Move the bookmark cursor to the first row.
+            bookmarkCursor.moveToFirst()
 
-                // Display the bitmap in the bookmark favorite icon.
-                bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap)
+            // 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))
 
-                // Display the bookmark name from the cursor in the bookmark name text view.
-                bookmarkNameTextView.text = cursor.getString(cursor.getColumnIndexOrThrow(BookmarksDatabaseHelper.BOOKMARK_NAME))
+                // 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)))
 
-                // 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
+                // Close the bookmarks drawer if it is not pinned.
+                if (!bookmarksDrawerPinned)
+                    drawerLayout.closeDrawer(GravityCompat.END)
             }
-        }
 
-        // Populate the list view with the adapter.
-        bookmarksListView.adapter = bookmarksCursorAdapter
+            // Close the cursor.
+            bookmarkCursor.close()
+        }
 
-        // Set the bookmarks drawer title.
-        if (currentBookmarksFolder.isEmpty())
-            bookmarksTitleTextView.setText(R.string.bookmarks)
-        else
-            bookmarksTitleTextView.text = currentBookmarksFolder
-    }
+        // 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()
 
-    private fun openWithApp(url: String) {
-        // Create an open with app intent with `ACTION_VIEW`.
-        val openWithAppIntent = Intent(Intent.ACTION_VIEW)
+            // 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)
 
-        // Set the URI but not the MIME type.  This should open all available apps.
-        openWithAppIntent.data = Uri.parse(url)
+                // Get a cursor of all the bookmarks in the folder.
+                val bookmarksCursor = bookmarksDatabaseHelper!!.getFolderBookmarks(folderId)
 
-        // Flag the intent to open in a new task.
-        openWithAppIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                // Move to the first entry in the cursor.
+                bookmarksCursor.moveToFirst()
 
-        // 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()
-        }
-    }
+                // 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(BOOKMARK_URL)), !bookmarksDrawerPinned && (i == 0))
 
-    private fun openWithBrowser(url: String) {
+                    // Move to the next bookmark.
+                    bookmarksCursor.moveToNext()
+                }
 
-        // Create an open with browser intent with `ACTION_VIEW`.
-        val openWithBrowserIntent = Intent(Intent.ACTION_VIEW)
+                // Close the cursor.
+                bookmarksCursor.close()
+            } else {  // The bookmark is not a folder.
+                // Get the bookmark cursor for this ID.
+                val bookmarkCursor = bookmarksDatabaseHelper!!.getBookmark(databaseId)
 
-        // Set the URI and the MIME type.  `"text/html"` should load browser options.
-        openWithBrowserIntent.setDataAndType(Uri.parse(url), "text/html")
+                // Move the bookmark cursor to the first row.
+                bookmarkCursor.moveToFirst()
 
-        // Flag the intent to open in a new task.
-        openWithBrowserIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                // Load the bookmark in a new tab and move to the tab if the drawer is not pinned.
+                addNewTab(bookmarkCursor.getString(bookmarkCursor.getColumnIndexOrThrow(BOOKMARK_URL)), !bookmarksDrawerPinned)
 
-        // 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()
-        }
-    }
+                // Close the cursor.
+                bookmarkCursor.close()
+            }
 
-    private fun sanitizeUrl(urlString: String): String {
-        // Initialize a sanitized URL string.
-        var sanitizedUrlString = urlString
+            // Close the bookmarks drawer if it is not pinned.
+            if (!bookmarksDrawerPinned)
+                drawerLayout.closeDrawer(GravityCompat.END)
 
-        // Sanitize tracking queries.
-        if (sanitizeTrackingQueries)
-            sanitizedUrlString = SanitizeUrlHelper.sanitizeTrackingQueries(sanitizedUrlString)
+            // Consume the event.
+            true
+        }
 
-        // Sanitize AMP redirects.
-        if (sanitizeAmpRedirects)
-            sanitizedUrlString = SanitizeUrlHelper.sanitizeAmpRedirects(sanitizedUrlString)
+        // The drawer listener is used to update the navigation menu.
+        drawerLayout.addDrawerListener(object : DrawerLayout.DrawerListener {
+            override fun onDrawerSlide(drawerView: View, slideOffset: Float) {}
 
-        // Return the sanitized URL string.
-        return sanitizedUrlString
-    }
+            override fun onDrawerOpened(drawerView: View) {}
 
-    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]
+            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()
+            }
 
-        // 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())
+            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)
 
-                // Get the new tab.
-                val newTab = tabLayout.getTabAt(i)!!
+                        // Hide the keyboard (if displayed).
+                        inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
+                    }
 
-                // Set a custom view on the new tab.
-                newTab.setCustomView(R.layout.tab_custom_view)
+                    // 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()
 
-                // Add the new page.
-                webViewPagerAdapter!!.restorePage(savedStateArrayList!![i], savedNestedScrollWebViewStateArrayList!![i])
+                    // 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()
+                }
             }
+        })
 
-            // Reset the saved state variables.
-            savedStateArrayList = null
-            savedNestedScrollWebViewStateArrayList = null
+        // 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)
 
-            // 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 a handle for the WebView.
+        val bareWebView = webViewLayout.findViewById<WebView>(R.id.bare_webview)
 
-            // Get the intent that started the app.
-            val intent = intent
+        // Store the default user agent.
+        webViewDefaultUserAgent = bareWebView.settings.userAgentString
 
-            // Reset the intent.  This prevents a duplicate tab from being created on restart.
-            setIntent(Intent())
+        // Destroy the bare WebView.
+        bareWebView.destroy()
 
-            // Get the information from the intent.
-            val intentAction = intent.action
-            val intentUriData = intent.data
-            val intentStringExtra = intent.getStringExtra(Intent.EXTRA_TEXT)
+        // Update the domains settings set.
+        updateDomainsSettingsSet()
 
-            // Determine if this is a web search.
-            val isWebSearch = (intentAction != null) && (intentAction == Intent.ACTION_WEB_SEARCH)
+        // Instantiate the check filter list helper.
+        checkFilterListHelper = CheckFilterListHelper()
+    }
 
-            // 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) {
-                        ""
-                    }
+    @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))
 
-                    // 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!!
-                }
+        // Get the WebView theme entry values string array.
+        val webViewThemeEntryValuesStringArray = resources.getStringArray(R.array.webview_theme_entry_values)
 
-                // 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
+        // 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)
 
-                    // Add a new tab.
-                    addNewTab(urlString, true)
-                } else {  // Load the URL in the current tab.
-                    // Make it so.
-                    loadUrl(currentWebView!!, urlString)
+                // 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
+
+                // 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)
                 }
             }
         }
-    }
 
-    // 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)
-    }
+        // Get a handle for the input method manager.
+        val inputMethodManager = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
 
-    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()
+        // Set the app bar scrolling.
+        nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
 
-        // 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
+        // Allow pinch to zoom.
+        nestedScrollWebView.settings.builtInZoomControls = true
 
-        // Add a new tab.
-        tabLayout.addTab(tabLayout.newTab())
+        // Hide zoom controls.
+        nestedScrollWebView.settings.displayZoomControls = false
 
-        // Get the new tab.
-        val newTab = tabLayout.getTabAt(newTabNumber)!!
+        // Don't allow mixed content (HTTP and HTTPS) on the same website.
+        nestedScrollWebView.settings.mixedContentMode = WebSettings.MIXED_CONTENT_NEVER_ALLOW
 
-        // Set a custom view on the new tab.
-        newTab.setCustomView(R.layout.tab_custom_view)
+        // Set the WebView to load in overview mode (zoomed out to the maximum width).
+        nestedScrollWebView.settings.loadWithOverviewMode = true
 
-        // Add the new WebView page.
-        webViewPagerAdapter!!.addPage(newTabNumber, webViewPager, urlString, moveToTab)
+        // Explicitly disable geolocation.
+        nestedScrollWebView.settings.setGeolocationEnabled(false)
 
-        // 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)
+        // 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
 
-            // Make it so.
-            objectAnimator.start()
-        }
-    }
+        // 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
 
-    // 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()
-    }
+                    // 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)
 
-    private fun closeCurrentTab() {
-        // Get the current tab number.
-        val currentTabNumber = tabLayout.selectedTabPosition
+                            // Hide the tab linear layout.
+                            tabsLinearLayout.visibility = View.GONE
 
-        // Delete the current tab.
-        tabLayout.removeTabAt(currentTabNumber)
+                            // Hide the app bar.
+                            appBar.hide()
 
-        // 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)
-    }
+                            // 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
 
-    private fun exitFullScreenVideo() {
-        // Re-enable the screen timeout.
-        fullScreenVideoFrameLayout.keepScreenOn = false
+                                    // 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)
 
-        // Unset the full screen video flag.
-        displayingFullScreenVideo = false
+                                    // 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)
+                                }
+                            }
+                        }
 
-        // Remove all the views from the full screen video frame layout.
-        fullScreenVideoFrameLayout.removeAllViews()
+                        /* 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 full screen video frame layout.
-        fullScreenVideoFrameLayout.visibility = View.GONE
+                        // 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
 
-        // Enable the sliding drawers.
-        drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
+                            // Show the app bar.
+                            appBar.show()
+                        }
 
-        // Show the coordinator layout.
-        coordinatorLayout.visibility = View.VISIBLE
+                        // 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
 
-        // 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
-
-                // Hide the app bar.
-                appBar.hide()
-            }
+                                // 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)
 
-            /* 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 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)
+                            }
+                        }
 
-            // 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
-        }
-    }
+                        // 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
+                    }
 
-    private fun clearAndExit() {
-        // Close the bookmarks cursor if it exists.
-        bookmarksCursor?.close()
+                    // Consume the double-tap.
+                    true
+                } else { // Do not consume the double-tap because full screen browsing mode is disabled.
+                    // Return false.
+                    false
+                }
+            }
 
-        // Close the databases helpers if they exist.
-        bookmarksDatabaseHelper?.close()
-        domainsDatabaseHelper?.close()
+            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 status of the clear everything preference.
-        val clearEverything = sharedPreferences.getBoolean(getString(R.string.clear_everything_key), true)
+                    // 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())
+                    }
 
-        // Get a handle for the runtime.
-        val runtime = Runtime.getRuntime()
+                    // Make it so.
+                    objectAnimator.start()
+                }
 
-        // 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
+                // Do not consume the event.
+                return false
+            }
+        })
 
-        // 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)
+        // 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()
 
-            // Ask the cookie manager to flush the cookie database.
-            cookieManager.flush()
+            // Check for double-taps.
+            doubleTapGestureDetector.onTouchEvent(motionEvent!!)
+        }
 
-            // 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")
+        // Register the WebView for a context menu.  This is used to see link targets and download images.
+        registerForContextMenu(nestedScrollWebView)
 
-                // Wait until the processes have finished.
-                deleteCookiesProcess.waitFor()
-                deleteCookiesJournalProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
-            }
-        }
+        // 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.
 
-        // 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()
+                // 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)
+                }
 
-            // 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/"))
+                // Get the file name from the content disposition.
+                val fileNameString = UrlHelper.getFileName(this, contentDisposition, mimetype, downloadUrlString!!)
 
-                // 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")
+                // Instantiate the save dialog.
+                val saveDialogFragment = SaveDialog.saveUrl(downloadUrlString, fileNameString, formattedFileSizeString, userAgent!!, nestedScrollWebView.acceptCookies)
 
-                // 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.
+                // 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)))
+                }
             }
         }
 
-        // 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()
+        // 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
 
-            // 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"))
+                // Build the match string.
+                val matchString = "$activeMatch/$numberOfMatches"
 
-                // Wait until the processes have finished.
-                deleteWebDataProcess.waitFor()
-                deleteWebDataJournalProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
+                // Update the find on page count text view.
+                findOnPageCountTextView.text = matchString
             }
         }
 
-        // 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")
+        // 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 for the process to finish.
-                process.waitFor()
-            } catch (exception: IOException) {
-                // Do nothing.
-            } catch (exception: InterruptedException) {
-                // Do nothing.
+            // 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
             }
         }
 
-        // 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)
+        // 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
 
-                // Get the WebView fragment view.
-                val webViewFragmentView = webViewTabFragment.view
+                // 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
 
-                // 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)
+                    //Stop the swipe to refresh indicator if it is running
+                    swipeRefreshLayout.isRefreshing = false
 
-                    // Clear the cache for this WebView.
-                    nestedScrollWebView.clearCache(true)
+                    // 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
                 }
             }
 
-            // Manually delete the cache directories.
-            try {
-                // Delete the main cache directory.
-                val deleteCacheProcess = runtime.exec("rm -rf $privateDataDirectoryString/cache")
+            // 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)
 
-                // 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 currentPosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-                // Wait until the processes have finished.
-                deleteCacheProcess.waitFor()
-                deleteServiceWorkerProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
-            }
-        }
-
-        // Wipe out each WebView.
-        for (i in 0 until webViewPagerAdapter!!.count) {
-            // Get the WebView tab fragment.
-            val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(i)
-
-            // Get the WebView frame layout.
-            val webViewFrameLayout = webViewTabFragment.view as FrameLayout?
-
-            // 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)
-
-                // Clear SSL certificate preferences for this WebView.
-                nestedScrollWebView.clearSslPreferences()
+                    // Get the current tab.
+                    val tab = tabLayout.getTabAt(currentPosition)
 
-                // Clear the back/forward history for this WebView.
-                nestedScrollWebView.clearHistory()
+                    // Check to see if the tab has been populated.
+                    if (tab != null) {
+                        // Get the custom view from the tab.
+                        val tabView = tab.customView
 
-                // Remove all the views from the frame layout.
-                webViewFrameLayout.removeAllViews()
+                        // 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)
 
-                // Destroy the internal state of the WebView.
-                nestedScrollWebView.destroy()
+                            // Display the favorite icon in the tab.
+                            tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true))
+                        }
+                    }
+                }
             }
-        }
 
-        // 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")
+            // 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)
 
-                // Wait until the process has finished.
-                deleteAppWebviewProcess.waitFor()
-            } catch (exception: Exception) {
-                // Do nothing if an error is thrown.
-            }
-        }
+                // Get the current tab.
+                val tab = tabLayout.getTabAt(currentPosition)
 
-        // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
-        finishAndRemoveTask()
+                // 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
 
-        // Remove the terminated program from RAM.  The status code is `0`.
-        exitProcess(0)
-    }
+                    // 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)
 
-    // 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)
+                        // 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
+                        }
+                    }
+                }
+            }
 
-            // Load the new folder.
-            loadBookmarksFolder()
-        }
-    }
+            // Enter full screen video.
+            override fun onShowCustomView(video: View, callback: CustomViewCallback) {
+                // Set the full screen video flag.
+                displayingFullScreenVideo = true
 
-        // 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
+                // Hide the keyboard.
+                inputMethodManager.hideSoftInputFromWindow(nestedScrollWebView.windowToken, 0)
 
-        // Update the bookmarks drawer pinned image view.
-        updateBookmarksDrawerPinnedImageView()
-    }
+                // Hide the coordinator layout.
+                coordinatorLayout.visibility = View.GONE
 
-    private fun updateBookmarksDrawerPinnedImageView() {
-        // Set the current icon.
-        if (bookmarksDrawerPinned)
-            bookmarksDrawerPinnedImageView.setImageResource(R.drawable.pin_selected)
-        else
-            bookmarksDrawerPinnedImageView.setImageResource(R.drawable.pin)
-    }
+                /* 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.
+                 */
 
-    private fun setCurrentWebView(pageNumber: Int) {
-        // Stop the swipe to refresh indicator if it is running
-        swipeRefreshLayout.isRefreshing = 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
 
-        // Get the WebView tab fragment.
-        val webViewTabFragment = webViewPagerAdapter!!.getPageFragment(pageNumber)
+                // Disable the sliding drawers.
+                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
 
-        // Get the fragment view.
-        val webViewFragmentView = webViewTabFragment.view
+                // Add the video view to the full screen video frame layout.
+                fullScreenVideoFrameLayout.addView(video)
 
-        // 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)
+                // Show the full screen video frame layout.
+                fullScreenVideoFrameLayout.visibility = View.VISIBLE
 
-            // 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
+                // Disable the screen timeout while the video is playing.  YouTube does this automatically, but not all other videos do.
+                fullScreenVideoFrameLayout.keepScreenOn = true
             }
 
-            // Set the cookie status.
-            cookieManager.setAcceptCookie(currentWebView!!.acceptCookies)
-
-            // Update the privacy icons.  `true` redraws the icons in the app bar.
-            updatePrivacyIcons(true)
-
-            // Get a handle for the input method manager.
-            val inputMethodManager = (getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager)
-
-            // Get the current URL.
-            val urlString = currentWebView!!.url
+            // Exit full screen video.
+            override fun onHideCustomView() {
+                // Exit the full screen video.
+                exitFullScreenVideo()
+            }
 
-            // 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("")
+            // Upload files.
+            override fun onShowFileChooser(webView: WebView, filePathCallback: ValueCallback<Array<Uri>>, fileChooserParams: FileChooserParams): Boolean {
+                // Store the file path callback.
+                fileChooserCallback = filePathCallback
 
-                    // Request focus for the URL text box.
-                    urlEditText.requestFocus()
+                // Create an intent to open a chooser based on the file chooser parameters.
+                val fileChooserIntent = fileChooserParams.createIntent()
 
-                    // Display the keyboard.
-                    inputMethodManager.showSoftInput(urlEditText, 0)
-                } else {  // The WebView has a loaded URL.
-                    // Clear the focus from the URL text box.
-                    urlEditText.clearFocus()
+                // 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)
 
-                    // Hide the soft keyboard.
-                    inputMethodManager.hideSoftInputFromWindow(currentWebView!!.windowToken, 0)
+                    // Request an openable file.
+                    genericFileChooserIntent.addCategory(Intent.CATEGORY_OPENABLE)
 
-                    // Display the current URL in the URL text box.
-                    urlEditText.setText(urlString)
+                    // Set the file type to everything.
+                    genericFileChooserIntent.type = "*/*"
 
-                    // Highlight the URL syntax.
-                    UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
+                    // Launch the generic file chooser intent.
+                    browseFileUploadActivityResultLauncher.launch(genericFileChooserIntent)
                 }
-            } 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)
-            }
-        } 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())
 
-            // Create a runnable to set the current WebView.
-            val setCurrentWebWebRunnable = Runnable {
-                // Set the current WebView.
-                setCurrentWebView(pageNumber)
+                // Handle the event.
+                return true
             }
-
-            // Try setting the current WebView again after 100 milliseconds.
-            setCurrentWebViewHandler.postDelayed(setCurrentWebWebRunnable, 100)
         }
-    }
+        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()
 
-    @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))
+                // Sanitize the url.
+                requestUrlString = sanitizeUrl(requestUrlString)
 
-        // Get the WebView theme entry values string array.
-        val webViewThemeEntryValuesStringArray = resources.getStringArray(R.array.webview_theme_entry_values)
+                // 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 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)
+                    // 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)
 
-                // 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
-
-                // 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)
-                }
-            }
-        }
-
-        // Get a handle for the input method manager.
-        val inputMethodManager = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
-
-        // Instantiate the blocklist helper.  TODO.  Make a class instance.
-        val blocklistHelper = BlocklistHelper()
-
-        // Set the app bar scrolling.
-        nestedScrollWebView.isNestedScrollingEnabled = scrollAppBar
-
-        // Allow pinch to zoom.
-        nestedScrollWebView.settings.builtInZoomControls = true
-
-        // Hide zoom controls.
-        nestedScrollWebView.settings.displayZoomControls = false
-
-        // Don't allow mixed content (HTTP and HTTPS) on the same website.
-        nestedScrollWebView.settings.mixedContentMode = WebSettings.MIXED_CONTENT_NEVER_ALLOW
-
-        // Set the WebView to load in overview mode (zoomed out to the maximum width).
-        nestedScrollWebView.settings.loadWithOverviewMode = true
-
-        // 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
+                    // Parse the url and set it as the data for the intent.
+                    emailIntent.data = Uri.parse(requestUrlString)
 
-                            // Hide the app bar.
-                            appBar.hide()
+                    // Open the email program in a new task instead of as part of Privacy Browser.
+                    emailIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                            // 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
+                    try {
+                        // Make it so.
+                        startActivity(emailIntent)
+                    } catch (exception: ActivityNotFoundException) {
+                        // Display a snackbar.
+                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                    }
 
-                                    // 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)
+                    // 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)
 
-                                    // 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)
-                                }
-                            }
-                        }
+                    // Add the phone number to the intent.
+                    dialIntent.data = Uri.parse(requestUrlString)
 
-                        /* 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.
-                         */
+                    // Open the dialer in a new task instead of as part of Privacy Browser.
+                    dialIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                        // 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
+                    try {
+                        // Make it so.
+                        startActivity(dialIntent)
+                    } catch (exception: ActivityNotFoundException) {
+                        // Display a snackbar.
+                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                    }
 
-                            // Show the app bar.
-                            appBar.show()
-                        }
+                    // 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)
 
-                        // 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 URL to the intent.
+                    genericIntent.data = Uri.parse(requestUrlString)
 
-                                // 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)
+                    // List all apps that can handle the URL instead of just opening the first one.
+                    genericIntent.addCategory(Intent.CATEGORY_BROWSABLE)
 
-                                // 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)
-                            }
-                        }
+                    // Open the app in a new task instead of as part of Privacy Browser.
+                    genericIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                        // 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
+                    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()
                     }
 
-                    // Consume the double-tap.
+                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
                     true
-                } else { // Do not consume the double-tap because full screen browsing mode is disabled.
-                    // Return false.
-                    false
                 }
             }
 
-            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
-
-                    // 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())
-                    }
+            // Check requests against the block lists.
+            override fun shouldInterceptRequest(view: WebView, webResourceRequest: WebResourceRequest): WebResourceResponse? {
+                // Get the URL.
+                val requestUrlString = webResourceRequest.url.toString()
 
-                    // Make it so.
-                    objectAnimator.start()
+                // 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
                 }
 
-                // Do not consume the event.
-                return false
-            }
-        })
+                // 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.
+                    }
+                }
 
-        // 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()
+                // Create an empty web resource response to be used if the resource request is blocked.
+                val emptyWebResourceResponse = WebResourceResponse("text/plain", "utf8", ByteArrayInputStream("".toByteArray()))
 
-            // Check for double-taps.
-            doubleTapGestureDetector.onTouchEvent(motionEvent!!)
-        }
+                // Initialize the variables.
+                var allowListResultStringArray: Array<String>? = null
+                var isThirdPartyRequest = false
 
-        // Register the WebView for a context menu.  This is used to see link targets and download images.
-        registerForContextMenu(nestedScrollWebView)
+                // Get the current URL.  `.getUrl()` throws an error because operations on the WebView cannot be made from this thread.
+                var currentBaseDomain = nestedScrollWebView.currentDomainName
 
-        // 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.
+                // Store a copy of the current domain for use in later requests.
+                val currentDomain = currentBaseDomain
 
-                // 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)
-                }
+                // Get the request host name.
+                var requestBaseDomain = webResourceRequest.url.host
 
-                // Get the file name from the content disposition.
-                val fileNameString = UrlHelper.getFileName(this, contentDisposition, mimetype, downloadUrlString!!)
+                // 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)
+                    }
 
-                // Instantiate the save dialog.
-                val saveDialogFragment = SaveDialog.saveUrl(downloadUrlString, fileNameString, formattedFileSizeString, userAgent!!, nestedScrollWebView.acceptCookies)
+                    // 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)
+                    }
 
-                // 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)))
+                    // Update the third party request tracker.
+                    isThirdPartyRequest = currentBaseDomain != requestBaseDomain
                 }
-            }
-        }
-
-        // 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
-
-                // Build the match string.
-                val matchString = "$activeMatch/$numberOfMatches"
-
-                // Update the find on page count text view.
-                findOnPageCountTextView.text = matchString
-            }
-        }
 
-        // 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
+                // Get the current WebView page position.
+                val webViewPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-            // 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.
-                 */
+                // Determine if the WebView is currently displayed.
+                val webViewDisplayed = (webViewPagePosition == tabLayout.selectedTabPosition)
 
-                // 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
-            }
-        }
+                // Block third-party requests if enabled.
+                if (isThirdPartyRequest && nestedScrollWebView.blockAllThirdPartyRequests) {
+                    // Add the result to the resource requests.
+                    nestedScrollWebView.addResourceRequest(arrayOf(REQUEST_THIRD_PARTY, requestUrlString))
 
-        // 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(THIRD_PARTY_REQUESTS)
 
-                // 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)
+                                optionsBlockAllThirdPartyRequestsMenuItem.title =
+                                    nestedScrollWebView.getRequestsCount(THIRD_PARTY_REQUESTS).toString() + " - " + getString(R.string.block_all_third_party_requests)
+                            }
+                        }
+                    }
 
-                    // 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
                 }
-            }
 
-            // 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 UltraList if it is enabled.
+                if (nestedScrollWebView.ultraListEnabled) {
+                    // Check the URL against UltraList.
+                    val ultraListResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, ultraList)
 
-                    // Get the current tab.
-                    val tab = tabLayout.getTabAt(currentPosition)
+                    // 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 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(com.stoutner.privacybrowser.views.ULTRALIST)
 
-                        // 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)
+                                    optionsUltraListMenuItem.title = nestedScrollWebView.getRequestsCount(com.stoutner.privacybrowser.views.ULTRALIST).toString() + " - " + getString(R.string.ultralist)
+                                }
+                            }
                         }
+
+                        // 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
                     }
                 }
-            }
 
-            // 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 UltraPrivacy if it is enabled.
+                if (nestedScrollWebView.ultraPrivacyEnabled) {
+                    // Check the URL against UltraPrivacy.
+                    val ultraPrivacyResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, ultraPrivacy!!)
 
-                // Get the current tab.
-                val tab = tabLayout.getTabAt(currentPosition)
+                    // 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]))
 
-                // 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(ULTRAPRIVACY)
 
-                    // 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)
+                                    optionsUltraPrivacyMenuItem.title = nestedScrollWebView.getRequestsCount(ULTRAPRIVACY).toString() + " - " + getString(R.string.ultraprivacy)
+                                }
+                            }
                         }
+
+                        // 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]))
+
+                        // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
+                        return null
                     }
                 }
-            }
 
-            // Enter full screen video.
-            override fun onShowCustomView(video: View, callback: CustomViewCallback) {
-                // Set the full screen video flag.
-                displayingFullScreenVideo = true
+                // Check EasyList if it is enabled.
+                if (nestedScrollWebView.easyListEnabled) {
+                    // Check the URL against EasyList.
+                    val easyListResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, easyList)
 
-                // Hide the keyboard.
-                inputMethodManager.hideSoftInputFromWindow(nestedScrollWebView.windowToken, 0)
+                    // 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]))
 
-                // Hide the coordinator layout.
-                coordinatorLayout.visibility = View.GONE
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(EASYLIST)
 
-                /* 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 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)
 
-                // 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
+                                // 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)
+                                }
+                            }
+                        }
 
-                // Disable the sliding drawers.
-                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
+                        // 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])
+                    }
+                }
 
-                // Add the video view to the full screen video frame layout.
-                fullScreenVideoFrameLayout.addView(video)
+                // Check EasyPrivacy if it is enabled.
+                if (nestedScrollWebView.easyPrivacyEnabled) {
+                    // Check the URL against EasyPrivacy.
+                    val easyPrivacyResults = checkFilterListHelper.checkFilterList(currentDomain, requestUrlString, isThirdPartyRequest, easyPrivacy)
 
-                // Show the full screen video frame layout.
-                fullScreenVideoFrameLayout.visibility = View.VISIBLE
+                    // 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]))
 
-                // Disable the screen timeout while the video is playing.  YouTube does this automatically, but not all other videos do.
-                fullScreenVideoFrameLayout.keepScreenOn = true
-            }
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(EASYPRIVACY)
 
-            // Exit full screen video.
-            override fun onHideCustomView() {
-                // Exit the full screen video.
-                exitFullScreenVideo()
-            }
+                        // 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)
 
-            // Upload files.
-            override fun onShowFileChooser(webView: WebView, filePathCallback: ValueCallback<Array<Uri>>, fileChooserParams: FileChooserParams): Boolean {
-                // Store the file path callback.
-                fileChooserCallback = filePathCallback
+                                // 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)
+                                }
+                            }
+                        }
 
-                // Create an intent to open a chooser based on the file chooser parameters.
-                val fileChooserIntent = fileChooserParams.createIntent()
+                        // 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])
+                    }
+                }
 
-                // 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)
+                // 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)
 
-                    // Request an openable file.
-                    genericFileChooserIntent.addCategory(Intent.CATEGORY_OPENABLE)
+                    // 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]))
 
-                    // Set the file type to everything.
-                    genericFileChooserIntent.type = "*/*"
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(FANBOYS_ANNOYANCE_LIST)
 
-                    // Launch the generic file chooser intent.
-                    browseFileUploadActivityResultLauncher.launch(genericFileChooserIntent)
-                }
+                        // 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)
 
-                // 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()
+                                // 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)
+                                }
+                            }
+                        }
 
-                // Sanitize the url.
-                requestUrlString = sanitizeUrl(requestUrlString)
+                        // 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)
 
-                // 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)
+                    // 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]))
 
-                    // 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)
+                        // Increment the blocked requests counters.
+                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
+                        nestedScrollWebView.incrementRequestsCount(FANBOYS_SOCIAL_BLOCKING_LIST)
 
-                    // Parse the url and set it as the data for the intent.
-                    emailIntent.data = Uri.parse(requestUrlString)
+                        // 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)
 
-                    // Open the email program in a new task instead of as part of Privacy Browser.
-                    emailIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                                // 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)
+                                }
+                            }
+                        }
 
-                    try {
-                        // Make it so.
-                        startActivity(emailIntent)
-                    } catch (exception: ActivityNotFoundException) {
-                        // Display a snackbar.
-                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
+                        // 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])
                     }
+                }
 
-                    // 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)
+                // 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 phone number to the intent.
-                    dialIntent.data = Uri.parse(requestUrlString)
+                // The resource request has not been blocked.  `return null` loads the requested resource.
+                return null
+            }
 
-                    // Open the dialer in a new task instead of as part of Privacy Browser.
-                    dialIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+            // Handle HTTP authentication requests.
+            override fun onReceivedHttpAuthRequest(view: WebView, handler: HttpAuthHandler, host: String, realm: String) {
+                // Store the handler.
+                nestedScrollWebView.httpAuthHandler = handler
 
-                    try {
-                        // Make it so.
-                        startActivity(dialIntent)
-                    } catch (exception: ActivityNotFoundException) {
-                        // Display a snackbar.
-                        Snackbar.make(currentWebView!!, getString(R.string.error, exception), Snackbar.LENGTH_INDEFINITE).show()
-                    }
+                // Instantiate an HTTP authentication dialog.
+                val httpAuthenticationDialogFragment = HttpAuthenticationDialog.displayDialog(host, realm, nestedScrollWebView.webViewFragmentId)
 
-                    // 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)
+                // Show the HTTP authentication dialog.
+                httpAuthenticationDialogFragment.show(supportFragmentManager, getString(R.string.http_authentication))
+            }
 
-                    // Add the URL to the intent.
-                    genericIntent.data = Uri.parse(requestUrlString)
+            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
 
-                    // List all apps that can handle the URL instead of just opening the first one.
-                    genericIntent.addCategory(Intent.CATEGORY_BROWSABLE)
+                // 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)
 
-                    // Open the app in a new task instead of as part of Privacy Browser.
-                    genericIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                        // 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)
 
-                    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 to refresh circle doesn't always hide itself completely unless it is moved up 10 pixels.
+                        swipeRefreshLayout.setProgressViewOffset(false, defaultProgressViewStartOffset - 10 + appBarHeight, defaultProgressViewEndOffset + appBarHeight)
                     }
-
-                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
-                    true
                 }
-            }
 
-            // Check requests against the block lists.
-            override fun shouldInterceptRequest(view: WebView, webResourceRequest: WebResourceRequest): WebResourceResponse? {
-                // Get the URL.
-                val requestUrlString = webResourceRequest.url.toString()
+                // Reset the list of resource requests.
+                nestedScrollWebView.clearResourceRequests()
 
-                // 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
-                }
+                // Reset the requests counters.
+                nestedScrollWebView.resetRequestsCounters()
 
-                // 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.
-                    }
+                // 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)
                 }
 
-                // Create an empty web resource response to be used if the resource request is blocked.
-                val emptyWebResourceResponse = WebResourceResponse("text/plain", "utf8", ByteArrayInputStream("".toByteArray()))
+                // Reset the list of host IP addresses.
+                nestedScrollWebView.currentIpAddresses = ""
 
-                // Initialize the variables.
-                var whitelistResultStringArray: Array<String>? = null
-                var isThirdPartyRequest = false
+                // Get a URI for the current URL.
+                val currentUri = Uri.parse(url)
 
-                // Get the current URL.  `.getUrl()` throws an error because operations on the WebView cannot be made from this thread.
-                var currentBaseDomain = nestedScrollWebView.currentDomainName
+                // Get the current domain name.
+                val currentDomainName = currentUri.host
 
-                // Store a copy of the current domain for use in later requests.
-                val currentDomain = currentBaseDomain
+                // Get the IP addresses for the current domain.
+                if (!currentDomainName.isNullOrEmpty())
+                    GetHostIpAddressesCoroutine.checkPinnedMismatch(currentDomainName, nestedScrollWebView, supportFragmentManager, getString(R.string.pinned_mismatch))
 
-                // Get the request host name.
-                var requestBaseDomain = webResourceRequest.url.host
+                // 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)
 
-                // 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)
-                    }
+                    // Set the icon if it is displayed in the AppBar.
+                    if (displayAdditionalAppBarIcons)
+                        optionsRefreshMenuItem.setIcon(R.drawable.close_blue)
+                }
+            }
 
-                    // 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)
-                    }
+            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()
 
-                    // Update the third party request tracker.
-                    isThirdPartyRequest = currentBaseDomain != requestBaseDomain
-                }
+                // 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)
 
-                // Get the current WebView page position.
-                val webViewPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+                    // Reset the icon if it is displayed in the app bar.
+                    if (displayAdditionalAppBarIcons)
+                        optionsRefreshMenuItem.setIcon(R.drawable.refresh_enabled)
+                }
 
-                // Determine if the WebView is currently displayed.
-                val webViewDisplayed = webViewPagePosition == tabLayout.selectedTabPosition
+                // 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
 
-                // 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))
+                // Clear the cache, history, and logcat if Incognito Mode is enabled.
+                if (incognitoModeEnabled) {
+                    // Clear the cache.  `true` includes disk files.
+                    nestedScrollWebView.clearCache(true)
 
-                    // Increment the blocked requests counters.
-                    nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                    nestedScrollWebView.incrementRequestsCount(THIRD_PARTY_REQUESTS)
+                    // Clear the back/forward history.
+                    nestedScrollWebView.clearHistory()
 
-                    // 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)
+                    // 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.
+                    }
 
-                            // 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)
-                            }
-                        }
+                    // 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.
                     }
+                }
 
-                    // The resource request was blocked.  Return an empty web resource response.
-                    return emptyWebResourceResponse
+                // 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.
                 }
 
-                // Check UltraList if it is enabled.
-                if (nestedScrollWebView.ultraListEnabled) {
-                    // Check the URL against UltraList.
-                    val ultraListResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, ultraList)
+                // Get the current page position.
+                val currentPagePosition = webViewStateAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
 
-                    // 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 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
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(ULTRALIST)
+                // Get the current tab.
+                val tab = tabLayout.getTabAt(currentPagePosition)
 
-                        // 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)
+                // 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("")
 
-                                // 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)
-                                }
-                            }
-                        }
+                        // Request focus for the URL text box.
+                        urlEditText.requestFocus()
 
-                        // 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]))
+                        // Display the keyboard.
+                        inputMethodManager.showSoftInput(urlEditText, 0)
 
-                        // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
-                        return null
-                    }
-                }
+                        // Apply the domain settings.  This clears any settings from the previous domain.
+                        applyDomainSettings(nestedScrollWebView, "", resetTab = true, reloadWebsite = false, loadUrl = false)
 
-                // Check UltraPrivacy if it is enabled.
-                if (nestedScrollWebView.ultraPrivacyEnabled) {
-                    // Check the URL against UltraPrivacy.
-                    val ultraPrivacyResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, ultraPrivacy!!)
+                        // 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!!
 
-                    // 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]))
+                            // Get the title text view from the tab.
+                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(ULTRAPRIVACY)
+                            // 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)
 
-                        // 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)
+                            // 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)
 
-                                // 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)
-                                }
-                            }
+                            // Highlight the URL syntax.
+                            UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
                         }
 
-                        // 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]))
+                        // 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!!
 
-                        // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
-                        return null
+                            // Get the title text view from the tab.
+                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
+
+                            // Set the title as the tab text.  Sometimes `onReceivedTitle()` is not called, especially when navigating history.
+                            tabTitleTextView.text = nestedScrollWebView.title
+                        }
                     }
                 }
+            }
 
-                // Check EasyList if it is enabled.
-                if (nestedScrollWebView.easyListEnabled) {
-                    // Check the URL against EasyList.
-                    val easyListResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, easyList)
+            // 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
 
-                    // 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]))
+                // 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
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(EASYLIST)
+                // Get the pinned SSL certificate.
+                val (pinnedSslCertificateStringArray, pinnedSslCertificateDateArray) = nestedScrollWebView.getPinnedSslCertificate()
 
-                        // 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)
+                // 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 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)
-                                }
-                            }
-                        }
+                    // 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
 
-                        // 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])
+                    // Instantiate an SSL certificate error alert dialog.
+                    val sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error, nestedScrollWebView.webViewFragmentId)
+
+                    // 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 EasyPrivacy if it is enabled.
-                if (nestedScrollWebView.easyPrivacyEnabled) {
-                    // Check the URL against EasyPrivacy.
-                    val easyPrivacyResults = blocklistHelper.checkBlocklist(currentDomain, requestUrlString, isThirdPartyRequest, easyPrivacy)
-
-                    // 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]))
+        // 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
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(EASYPRIVACY)
+            // Get the intent that started the app.
+            val launchingIntent = 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)
+            // Reset the intent.  This prevents a duplicate tab from being created on restart.
+            intent = Intent()
 
-                                // 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)
-                                }
-                            }
-                        }
+            // Get the information from the intent.
+            val launchingIntentAction = launchingIntent.action
+            val launchingIntentUriData = launchingIntent.data
+            val launchingIntentStringExtra = launchingIntent.getStringExtra(Intent.EXTRA_TEXT)
 
-                        // 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])
-                    }
+            // 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) {
+                    ""
                 }
 
-                // 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)
+                // 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))
+            }
 
-                    // 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]))
+            // 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!!)
+            }
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(FANBOYS_ANNOYANCE_LIST)
+            // 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 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 focus and display the keyboard if the URL is blank.
+            if (urlString == "") {
+                // Request focus for the URL text box.
+                urlEditText.requestFocus()
 
-                                // 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)
-                                }
-                            }
-                        }
+                // Create a display keyboard handler.
+                val displayKeyboardHandler = Handler(Looper.getMainLooper())
 
-                        // 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)
+                // Create a display keyboard runnable.
+                val displayKeyboardRunnable = Runnable {
+                    // Display the keyboard.
+                    inputMethodManager.showSoftInput(urlEditText, 0)
+                }
 
-                    // 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]))
+                // Display the keyboard after 100 milliseconds, which leaves enough time for the tab to transition.
+                displayKeyboardHandler.postDelayed(displayKeyboardRunnable, 100)
+            }
+        }
+    }
 
-                        // Increment the blocked requests counters.
-                        nestedScrollWebView.incrementRequestsCount(BLOCKED_REQUESTS)
-                        nestedScrollWebView.incrementRequestsCount(FANBOYS_SOCIAL_BLOCKING_LIST)
+    private fun loadBookmarksFolder() {
+        // Update the bookmarks cursor with the contents of the bookmarks database for the current folder.
+        bookmarksCursor = bookmarksDatabaseHelper!!.getBookmarksByDisplayOrder(currentBookmarksFolderId)
 
-                        // 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)
+        // 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 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)
-                                }
-                            }
-                        }
+            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)
 
-                        // 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])
-                    }
-                }
+                // Get the favorite icon byte array from the cursor.
+                val favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndexOrThrow(FAVORITE_ICON))
 
-                // 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))
-                }
+                // 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 not been blocked.  `return null` loads the requested resource.
-                return null
+                // Display the bitmap in the bookmark favorite icon.
+                bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap)
+
+                // Display the bookmark name from the cursor in the bookmark name text view.
+                bookmarkNameTextView.text = cursor.getString(cursor.getColumnIndexOrThrow(BOOKMARK_NAME))
+
+                // 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
             }
+        }
 
-            // Handle HTTP authentication requests.
-            override fun onReceivedHttpAuthRequest(view: WebView, handler: HttpAuthHandler, host: String, realm: String) {
-                // Store the handler.
-                nestedScrollWebView.httpAuthHandler = handler
+        // Populate the list view with the adapter.
+        bookmarksListView.adapter = bookmarksCursorAdapter
 
-                // Instantiate an HTTP authentication dialog.
-                val httpAuthenticationDialogFragment = HttpAuthenticationDialog.displayDialog(host, realm, nestedScrollWebView.webViewFragmentId)
+        // 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)
+    }
 
-                // Show the HTTP authentication dialog.
-                httpAuthenticationDialogFragment.show(supportFragmentManager, getString(R.string.http_authentication))
-            }
+    private fun loadUrl(nestedScrollWebView: NestedScrollWebView, url: String) {
+        // Sanitize the URL.
+        val urlString = sanitizeUrl(url)
 
-            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
+        // Apply the domain settings and load the URL.
+        applyDomainSettings(nestedScrollWebView, urlString, resetTab = true, reloadWebsite = false, loadUrl = true)
+    }
 
-                // 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)
+    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 <= ' ' }
 
-                        // 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 the formatted URL string.
+        var urlString = ""
 
-                        // 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)
-                    }
-                }
+        // 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.
 
-                // Reset the list of resource requests.
-                nestedScrollWebView.clearResourceRequests()
+            // 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"
+
+            // Initialize the unformatted URL.
+            var unformattedUrl: URL? = null
+
+            // Convert the unformatted URL string to a URL.
+            try {
+                unformattedUrl = URL(unformattedUrlString)
+            } catch (exception: MalformedURLException) {
+                exception.printStackTrace()
+            }
 
-                // Reset the requests counters.
-                nestedScrollWebView.resetRequestsCounters()
+            // 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
 
-                // Get the current page position.
-                val currentPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+            // Create a URI.
+            val uri = Uri.Builder()
 
-                // 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)
+            // Build the URI from the components of the URL.
+            uri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment)
 
-                    // Highlight the URL syntax.
-                    UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
+            // 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) {
+                ""
+            }
 
-                    // Hide the keyboard.
-                    inputMethodManager.hideSoftInputFromWindow(nestedScrollWebView.windowToken, 0)
-                }
+            // Add the base search URL.
+            urlString = searchURL + encodedSearchString
+        }
 
-                // Reset the list of host IP addresses.
-                nestedScrollWebView.currentIpAddresses = ""
+        // 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()
 
-                // Get a URI for the current URL.
-                val currentUri = Uri.parse(url)
+        // Make it so.
+        loadUrl(currentWebView!!, urlString)
+    }
 
-                // Get the current domain name.
-                val currentDomainName = currentUri.host
+    override fun navigateHistory(url: String, steps: Int) {
+        // Apply the domain settings.
+        applyDomainSettings(currentWebView!!, url, resetTab = false, reloadWebsite = false, loadUrl = false)
 
-                // Get the IP addresses for the current domain.
-                if ((currentDomainName != null) && currentDomainName.isNotEmpty())
-                    GetHostIpAddressesCoroutine.checkPinnedMismatch(currentDomainName, nestedScrollWebView, supportFragmentManager, getString(R.string.pinned_mismatch))
+        // Load the history entry.
+        currentWebView!!.goBackOrForward(steps)
 
-                // 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)
+        // Update the URL edit text after a delay.
+        updateUrlEditTextAfterDelay()
+    }
 
-                    // Set the icon if it is displayed in the AppBar.
-                    if (displayAdditionalAppBarIcons)
-                        optionsRefreshMenuItem.setIcon(R.drawable.close_blue)
-                }
-            }
+    override fun openFile(dialogFragment: DialogFragment) {
+        // Get the dialog.
+        val dialog = dialogFragment.dialog!!
 
-            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()
+        // 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 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)
+        // Get the file path string.
+        val openFilePath = fileNameEditText.text.toString()
 
-                    // Reset the icon if it is displayed in the app bar.
-                    if (displayAdditionalAppBarIcons)
-                        optionsRefreshMenuItem.setIcon(R.drawable.refresh_enabled)
-                }
+        // 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 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
+        // 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))
 
-                // Clear the cache, history, and logcat if Incognito Mode is enabled.
-                if (incognitoModeEnabled) {
-                    // Clear the cache.  `true` includes disk files.
-                    nestedScrollWebView.clearCache(true)
+                // Create a temporary MHT file.
+                val temporaryMhtFile = File.createTempFile(TEMPORARY_MHT_FILE, ".mht", cacheDir)
 
-                    // Clear the back/forward history.
-                    nestedScrollWebView.clearHistory()
+                // Get a file output stream for the temporary MHT file.
+                val temporaryMhtFileOutputStream = FileOutputStream(temporaryMhtFile)
 
-                    // 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.
-                    }
+                // Create a transfer byte array.
+                val transferByteArray = ByteArray(1024)
 
-                    // 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.
-                    }
-                }
+                // Create an integer to track the number of bytes read.
+                var bytesRead: Int
 
-                // 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.
-                }
+                // 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)
 
-                // Get the current page position.
-                val currentPagePosition = webViewPagerAdapter!!.getPositionForId(nestedScrollWebView.webViewFragmentId)
+                // Flush the temporary MHT file output stream.
+                temporaryMhtFileOutputStream.flush()
 
-                // 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
+                // Close the streams.
+                temporaryMhtFileOutputStream.close()
+                mhtFileInputStream.close()
 
-                // Get the current tab.
-                val tab = tabLayout.getTabAt(currentPagePosition)
+                // 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)
+        }
+    }
 
-                // 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("")
+    private fun openWithApp(url: String) {
+        // Create an open with app intent with `ACTION_VIEW`.
+        val openWithAppIntent = Intent(Intent.ACTION_VIEW)
 
-                        // Request focus for the URL text box.
-                        urlEditText.requestFocus()
+        // Set the URI but not the MIME type.  This should open all available apps.
+        openWithAppIntent.data = Uri.parse(url)
 
-                        // Display the keyboard.
-                        inputMethodManager.showSoftInput(urlEditText, 0)
+        // Flag the intent to open in a new task.
+        openWithAppIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                        // Apply the domain settings.  This clears any settings from the previous domain.
-                        applyDomainSettings(nestedScrollWebView, "", resetTab = true, reloadWebsite = false, loadUrl = false)
+        // 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()
+        }
+    }
 
-                        // 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!!
+    private fun openWithBrowser(url: String) {
 
-                            // Get the title text view from the tab.
-                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
+        // Create an open with browser intent with `ACTION_VIEW`.
+        val openWithBrowserIntent = Intent(Intent.ACTION_VIEW)
 
-                            // 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)
+        // Set the URI and the MIME type.  `"text/html"` should load browser options.
+        openWithBrowserIntent.setDataAndType(Uri.parse(url), "text/html")
 
-                            // 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)
+        // Flag the intent to open in a new task.
+        openWithBrowserIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
 
-                            // Highlight the URL syntax.
-                            UrlHelper.highlightSyntax(urlEditText, initialGrayColorSpan, finalGrayColorSpan, redColorSpan)
-                        }
+        // 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()
+        }
+    }
 
-                        // 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!!
+    override fun pinnedErrorGoBack() {
+        // Get the current web back forward list.
+        val webBackForwardList = currentWebView!!.copyBackForwardList()
 
-                            // Get the title text view from the tab.
-                            val tabTitleTextView = tabView.findViewById<TextView>(R.id.title_textview)
+        // Get the previous entry URL.
+        val previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.currentIndex - 1).url
 
-                            // Set the title as the tab text.  Sometimes `onReceivedTitle()` is not called, especially when navigating history.
-                            tabTitleTextView.text = nestedScrollWebView.title
-                        }
-                    }
-                }
-            }
+        // Apply the domain settings.
+        applyDomainSettings(currentWebView!!, previousUrl, resetTab = false, reloadWebsite = false, loadUrl = false)
 
-            // 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
+        // Go back.
+        currentWebView!!.goBack()
 
-                // 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
+        // Update the URL edit text after a delay.
+        updateUrlEditTextAfterDelay()
+    }
 
-                // Get the pinned SSL certificate.
-                val (pinnedSslCertificateStringArray, pinnedSslCertificateDateArray) = nestedScrollWebView.getPinnedSslCertificate()
+    private fun sanitizeUrl(urlString: String): String {
+        // Initialize a sanitized URL string.
+        var sanitizedUrlString = urlString
 
-                // 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])) {
+        // Sanitize tracking queries.
+        if (sanitizeTrackingQueries)
+            sanitizedUrlString = SanitizeUrlHelper.sanitizeTrackingQueries(sanitizedUrlString)
 
-                    // 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
+        // Sanitize AMP redirects.
+        if (sanitizeAmpRedirects)
+            sanitizedUrlString = SanitizeUrlHelper.sanitizeAmpRedirects(sanitizedUrlString)
 
-                    // Instantiate an SSL certificate error alert dialog.
-                    val sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error, nestedScrollWebView.webViewFragmentId)
+        // Return the sanitized URL string.
+        return sanitizedUrlString
+    }
 
-                    // 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)))
-                    }
-                }
-            }
+    override fun saveUrl(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!!
+
+            // Get a handle for the dialog URL edit text.
+            val dialogUrlEditText = dialog.findViewById<EditText>(R.id.url_edittext)
+
+            // Get the URL from the edit text, which may have been modified.
+            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()
+        // 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) {
-                    ""
-                }
+        // 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)
 
-                // 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)
 
-                // Create a display keyboard handler.
-                val displayKeyboardHandler = Handler(Looper.getMainLooper())
+            // 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("")
+
+                    // 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
+            }
 
-                // Display the keyboard after 100 milliseconds, which leaves enough time for the tab to transition.
-                displayKeyboardHandler.postDelayed(displayKeyboardRunnable, 100)
+            // 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) || (pageNumber >= (webViewStateAdapter!!.itemCount - 1))) {  // The tab has not been populated yet.
+            //  Try again in 100 milliseconds if the app is being restored or the a new tab has been added (the last tab).
+            // Create a handler to set the current WebView.
+            val setCurrentWebViewHandler = Handler(Looper.getMainLooper())
+
+            // Create a runnable to set the current WebView.
+            val setCurrentWebWebRunnable = Runnable {
+                // Set the current WebView.
+                setCurrentWebView(pageNumber)
             }
+
+            // Try setting the current WebView again after 100 milliseconds.
+            setCurrentWebViewHandler.postDelayed(setCurrentWebWebRunnable, 100)
         }
     }
 
+    // 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 +6059,7 @@ 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 +6073,72 @@ 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()
+        }
+    }
+
+    fun updateUrlEditTextAfterDelay() {
+        // Create a handler to update the URL edit box.
+        val urlEditTextUpdateHandler = Handler(Looper.getMainLooper())
+
+        // Create a runnable to update the URL edit box.
+        val urlEditTextUpdateRunnable = Runnable {
+            // Update the URL edit text.
+            urlEditText.setText(currentWebView!!.url)
+
+            // Disable the wide viewport if the source is being viewed.
+            if (currentWebView!!.url!!.startsWith("view-source:"))
+                currentWebView!!.settings.useWideViewPort = false
+        }
+
+        // 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)
+    }
 }