]> gitweb.stoutner.com Git - PrivacyBrowserAndroid.git/blobdiff - app/src/main/java/com/stoutner/privacybrowser/activities/MainWebView.java
Create default .onion search option for when Orbot proxying is enabled. Implements...
[PrivacyBrowserAndroid.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebView.java
index 00ea17818b35ef6ce111c33c0dabcee5be73c8f7..3ee406ce8abe77c648230ca9c827766c2e69b0a7 100644 (file)
@@ -1,5 +1,7 @@
 /**
- * Copyright 2015-2016 Soren Stoutner <soren@stoutner.com>.
+ * Copyright 2015-2017 Soren Stoutner <soren@stoutner.com>.
+ *
+ * Download cookie code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
  *
  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
  *
@@ -22,6 +24,8 @@ package com.stoutner.privacybrowser.activities;
 import android.annotation.SuppressLint;
 import android.app.DialogFragment;
 import android.app.DownloadManager;
+import android.content.ClipData;
+import android.content.ClipboardManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -38,6 +42,7 @@ import android.preference.PreferenceManager;
 import android.print.PrintDocumentAdapter;
 import android.print.PrintManager;
 import android.support.annotation.NonNull;
+import android.support.design.widget.CoordinatorLayout;
 import android.support.design.widget.NavigationView;
 import android.support.design.widget.Snackbar;
 import android.support.v4.app.ActivityCompat;
@@ -52,19 +57,22 @@ import android.support.v7.app.AppCompatDialogFragment;
 import android.support.v7.widget.Toolbar;
 import android.text.Editable;
 import android.text.TextWatcher;
-import android.util.Log;
 import android.util.Patterns;
 import android.view.ContextMenu;
+import android.view.GestureDetector;
 import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.view.MotionEvent;
 import android.view.View;
+import android.view.WindowManager;
 import android.view.inputmethod.InputMethodManager;
 import android.webkit.CookieManager;
 import android.webkit.DownloadListener;
 import android.webkit.SslErrorHandler;
 import android.webkit.WebBackForwardList;
 import android.webkit.WebChromeClient;
+import android.webkit.WebResourceResponse;
 import android.webkit.WebStorage;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
@@ -77,12 +85,8 @@ import android.widget.ProgressBar;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 
-// These three GMS (Google Mobile Services) lines need to be removed for F-Droid to build correctly.
-import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
-import com.google.android.gms.common.GooglePlayServicesRepairableException;
-import com.google.android.gms.security.ProviderInstaller;
-
 import com.stoutner.privacybrowser.BannerAd;
+import com.stoutner.privacybrowser.BuildConfig;
 import com.stoutner.privacybrowser.R;
 import com.stoutner.privacybrowser.helpers.OrbotProxyHelper;
 import com.stoutner.privacybrowser.dialogs.CreateHomeScreenShortcut;
@@ -92,19 +96,25 @@ import com.stoutner.privacybrowser.dialogs.SslCertificateError;
 import com.stoutner.privacybrowser.dialogs.UrlHistory;
 import com.stoutner.privacybrowser.dialogs.ViewSslCertificate;
 
+import java.io.BufferedReader;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
 import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLEncoder;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 // We need to use AppCompatActivity from android.support.v7.app.AppCompatActivity to have access to the SupportActionBar until the minimum API is >= 21.
 public class MainWebView extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, CreateHomeScreenShortcut.CreateHomeScreenSchortcutListener,
         SslCertificateError.SslCertificateErrorListener, DownloadFile.DownloadFileListener, DownloadImage.DownloadImageListener, UrlHistory.UrlHistoryListener {
 
     // `appBar` is public static so it can be accessed from `OrbotProxyHelper`.
-    // It is also used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
+    // It is also used in `onCreate()`, `onOptionsItemSelected()`, `closeFindOnPage()`, and `applySettings()`.
     public static ActionBar appBar;
 
     // `favoriteIcon` is public static so it can be accessed from `CreateHomeScreenShortcut`, `Bookmarks`, `CreateBookmark`, `CreateBookmarkFolder`, and `EditBookmark`.
@@ -119,13 +129,22 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
     public static SslCertificate sslCertificate;
 
 
+    // `drawerLayout` is used in `onCreate()`, `onNewIntent()`, and `onBackPressed()`.
+    private DrawerLayout drawerLayout;
+
+    // `rootCoordinatorLayout` is used in `onCreate()` and `applySettings()`.
+    private CoordinatorLayout rootCoordinatorLayout;
+
     // 'mainWebView' is used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`, `findNextOnPage()`, `closeFindOnPage()`, and `loadUrlFromTextBox()`.
     private WebView mainWebView;
 
+    // `fullScreenVideoFrameLayout` is used in `onCreate()` and `onConfigurationChanged()`.
+    private FrameLayout fullScreenVideoFrameLayout;
+
     // `swipeRefreshLayout` is used in `onCreate()`, `onPrepareOptionsMenu`, and `onRestart()`.
     private SwipeRefreshLayout swipeRefreshLayout;
 
-    // `cookieManager` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`, and `onRestart()`.
+    // `cookieManager` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`, `onDownloadImage()`, `onDownloadFile()`, and `onRestart()`.
     private CookieManager cookieManager;
 
     // `customHeader` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateContextMenu()`, and `loadUrlFromTextBox()`.
@@ -135,7 +154,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
     // It is `Boolean` instead of `boolean` because `applySettings()` needs to know if it is `null`.
     private Boolean javaScriptEnabled;
 
-    // `firstPartyCookiesEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applySettings()`.
+    // `firstPartyCookiesEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onDownloadImage()`, `onDownloadFile()`, and `applySettings()`.
     private boolean firstPartyCookiesEnabled;
 
     // `thirdPartyCookiesEnabled` used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applySettings()`.
@@ -159,14 +178,35 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
     // `javaScriptEnabledSearchURL` is used in `loadURLFromTextBox()` and `applySettings()`.
     private String javaScriptEnabledSearchURL;
 
+    // `adBlockerEnabled` is used in `onCreate()` and `applySettings()`.
+    private boolean adBlockerEnabled;
+
+    // `fullScreenBrowsingModeEnabled` is used in `onCreate()` and `applySettings()`.
+    private boolean fullScreenBrowsingModeEnabled;
+
+    // `inFullScreenBrowsingMode` is used in `onCreate()` and `applySettings()`.
+    private boolean inFullScreenBrowsingMode;
+
+    // `hideSystemBarsOnFullscreen` is used in `onCreate()` and `applySettings()`.
+    private boolean hideSystemBarsOnFullscreen;
+
+    // `translucentNavigationBarOnFullscreen` is used in `onCreate()` and `applySettings()`.
+    private boolean translucentNavigationBarOnFullscreen;
+
+    // `findOnPageLinearLayout` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
+    private LinearLayout findOnPageLinearLayout;
+
+    // `findOnPageEditText` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
+    private EditText findOnPageEditText;
+
     // `mainMenu` is used in `onCreateOptionsMenu()` and `updatePrivacyIcons()`.
     private Menu mainMenu;
 
     // `drawerToggle` is used in `onCreate()`, `onPostCreate()`, `onConfigurationChanged()`, `onNewIntent()`, and `onNavigationItemSelected()`.
     private ActionBarDrawerToggle drawerToggle;
 
-    // `drawerLayout` is used in `onCreate()`, `onNewIntent()`, and `onBackPressed()`.
-    private DrawerLayout drawerLayout;
+    // `supportAppBar` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
+    private Toolbar supportAppBar;
 
     // `urlTextBox` is used in `onCreate()`, `onOptionsItemSelected()`, and `loadUrlFromTextBox()`.
     private EditText urlTextBox;
@@ -177,40 +217,28 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
     // `sslErrorHandler` is used in `onCreate()`, `onSslErrorCancel()`, and `onSslErrorProceed`.
     private SslErrorHandler sslErrorHandler;
 
-    // `findOnPageEditText` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
-    private EditText findOnPageEditText;
-
     // `inputMethodManager` is used in `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `closeFindOnPage()`.
     private InputMethodManager inputMethodManager;
 
+    // `mainWebViewRelativeLayout` is used in `onCreate()` and `onNavigationItemSelected()`.
+    private RelativeLayout mainWebViewRelativeLayout;
+
     @Override
     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.  The whole premise of Privacy Browser is built around an understanding of these dangers.
     @SuppressLint("SetJavaScriptEnabled")
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.main_coordinatorlayout);
-
-        // API 19 uses an old version of OpenSSL, which exposes users to man-in-the-middle attacks.
-        if (Build.VERSION.SDK_INT == 19) {
-            try {
-                // Update OpenSSL using Google Play Services.  This command must be removed for the build to succeed on F-Droid.
-                ProviderInstaller.installIfNeeded(this);
-            } catch (GooglePlayServicesRepairableException exception) {
-                Log.i("Privacy Browser", "OpenSSL needs to be updated");
-            } catch (GooglePlayServicesNotAvailableException exception) {
-                Log.i("Privacy Browser", "OpenSSL cannot be updated because Google Play Services are not available");
-            }
-        }
+        setContentView(R.layout.drawerlayout);
 
         // Get a handle for `inputMethodManager`.
         inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
 
-        // We need to use the SupportActionBar from android.support.v7.app.ActionBar until the minimum API is >= 21.
-        Toolbar supportAppBar = (Toolbar) findViewById(R.id.appBar);
+        // We need to use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
+        supportAppBar = (Toolbar) findViewById(R.id.app_bar);
         setSupportActionBar(supportAppBar);
         appBar = getSupportActionBar();
 
-        // This is needed to get rid of the Android Studio warning that appBar might be null.
+        // This is needed to get rid of the Android Studio warning that `appBar` might be null.
         assert appBar != null;
 
         // Add the custom url_app_bar layout, which shows the favoriteIcon, urlTextBar, and progressBar.
@@ -239,15 +267,105 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             }
         });
 
-        // Get handles for `fullScreenVideoFrameLayout`, `mainWebView`, and `find_on_page_edittext`.
-        final FrameLayout fullScreenVideoFrameLayout = (FrameLayout) findViewById(R.id.fullScreenVideoFrameLayout);
+        // Get handles for views that need to be accessed.
+        drawerLayout = (DrawerLayout) findViewById(R.id.drawerlayout);
+        rootCoordinatorLayout = (CoordinatorLayout) findViewById(R.id.root_coordinatorlayout);
+        mainWebViewRelativeLayout = (RelativeLayout) findViewById(R.id.main_webview_relativelayout);
         mainWebView = (WebView) findViewById(R.id.mainWebView);
+        findOnPageLinearLayout = (LinearLayout) findViewById(R.id.find_on_page_linearlayout);
         findOnPageEditText = (EditText) findViewById(R.id.find_on_page_edittext);
+        fullScreenVideoFrameLayout = (FrameLayout) findViewById(R.id.full_screen_video_framelayout);
+
+        // Create a double-tap listener to toggle full-screen mode.
+        final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
+            // Override `onDoubleTap()`.  All other events are handled using the default settings.
+            @Override
+            public boolean onDoubleTap(MotionEvent event) {
+                if (fullScreenBrowsingModeEnabled) {  // Only process the double-tap if full screen browsing mode is enabled.
+                    // Toggle `inFullScreenBrowsingMode`.
+                    inFullScreenBrowsingMode = !inFullScreenBrowsingMode;
+
+                    if (inFullScreenBrowsingMode) {  // Switch to full screen mode.
+                        // Hide the `appBar`.
+                        appBar.hide();
+
+                        // Hide the `BannerAd` in the free flavor.
+                        if (BuildConfig.FLAVOR.contentEquals("free")) {
+                            BannerAd.hideAd(adView);
+                        }
+
+                        // Modify the system bars.
+                        if (hideSystemBarsOnFullscreen) {  // Hide everything.
+                            // Remove the translucent overlays.
+                            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+                            // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
+                            drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+
+                            /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+                             * 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 rehides them after they are shown.
+                             */
+                            rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+
+                            // Set `rootCoordinatorLayout` to fill the whole screen.
+                            rootCoordinatorLayout.setFitsSystemWindows(false);
+                        } else {  // Hide everything except the status and navigation bars.
+                            // Set `rootCoordinatorLayout` to fit under the status and navigation bars.
+                            rootCoordinatorLayout.setFitsSystemWindows(false);
+
+                            if (translucentNavigationBarOnFullscreen) {  // There is an Android Support Library bug that causes a scrim to print on the right side of the `Drawer Layout` when the navigation bar is displayed on the right of the screen.
+                                // Set the navigation bar to be translucent.
+                                getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+                            }
+                        }
+                    } else {  // Switch to normal viewing mode.
+                        // Show the `appBar`.
+                        appBar.show();
+
+                        // Show the `BannerAd` in the free flavor.
+                        if (BuildConfig.FLAVOR.contentEquals("free")) {
+                            // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
+                            BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
+
+                            // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
+                            adView = findViewById(R.id.adView);
+                        }
+
+                        // Remove the translucent navigation bar flag if it is set.
+                        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+
+                        // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
+                        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+                        // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
+                        rootCoordinatorLayout.setSystemUiVisibility(0);
+
+                        // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
+                        rootCoordinatorLayout.setFitsSystemWindows(true);
+                    }
+
+                    // Consume the double-tap.
+                    return true;
+                } else { // Do not consume the double-tap because full screen browsing mode is disabled.
+                    return false;
+                }
+            }
+        });
+
+        // Pass all touch events on `mainWebView` through `gestureDetector` to check for double-taps.
+        mainWebView.setOnTouchListener(new View.OnTouchListener() {
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+                // Send the `event` to `gestureDetector`.
+                return gestureDetector.onTouchEvent(event);
+            }
+        });
 
         // Update `findOnPageCountTextView`.
         mainWebView.setFindListener(new WebView.FindListener() {
             // Get a handle for `findOnPageCountTextView`.
-            TextView findOnPageCountTextView = (TextView) findViewById(R.id.find_on_page_count_textview);
+            final TextView findOnPageCountTextView = (TextView) findViewById(R.id.find_on_page_count_textview);
 
             @Override
             public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches, boolean isDoneCounting) {
@@ -310,16 +428,14 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             }
         });
 
-        // Create the navigation drawer.
-        drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
-        // `DrawerTitle` identifies the drawer in accessibility mode.
+        // `DrawerTitle` identifies the `DrawerLayout` in accessibility mode.
         drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer));
 
         // Listen for touches on the navigation menu.
-        final NavigationView navigationView = (NavigationView) findViewById(R.id.navigationView);
+        final NavigationView navigationView = (NavigationView) findViewById(R.id.navigationview);
         navigationView.setNavigationItemSelectedListener(this);
 
-        // Get handles for `navigationMenu` and the back and forward menu items.  The menu is zero-based, so item 1 and 2 and the second and third items in the menu.
+        // Get handles for `navigationMenu` and the back and forward menu items.  The menu is zero-based, so items 1, 2, and 3 are the second, third, and fourth entries in the menu.
         final Menu navigationMenu = navigationView.getMenu();
         final MenuItem navigationBackMenuItem = navigationMenu.getItem(1);
         final MenuItem navigationForwardMenuItem = navigationMenu.getItem(2);
@@ -352,7 +468,29 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
         });
 
         // drawerToggle creates the hamburger icon at the start of the AppBar.
-        drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation, R.string.close_navigation);
+        drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation_drawer, R.string.close_navigation_drawer);
+
+        // Initialize `adServerSet`.
+        final Set<String> adServersSet = new HashSet<>();
+
+        // Load the list of ad servers into memory.
+        try {
+            // Load `pgl.yoyo.org_adservers.txt` into a `BufferedReader`.
+            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(getAssets().open("pgl.yoyo.org_adservers.txt")));
+
+            // Create a string for storing each ad server.
+            String adServer;
+
+            // Populate `adServersSet`.
+            while ((adServer = bufferedReader.readLine()) != null) {
+                adServersSet.add(adServer);
+            }
+
+            // Close `bufferedReader`.
+            bufferedReader.close();
+        } catch (IOException ioException) {
+            // We're pretty sure the asset exists, so we don't need to worry about the `IOException` ever being thrown.
+        }
 
         mainWebView.setWebViewClient(new WebViewClient() {
             // `shouldOverrideUrlLoading` makes this `WebView` the default handler for URLs inside the app, so that links are not kicked out to other apps.
@@ -360,7 +498,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             @SuppressWarnings("deprecation")
             @Override
             public boolean shouldOverrideUrlLoading(WebView view, String url) {
-                // Use an external email program if the link begins with "mailto:".
+                // Use an external email program if the link begins with `mailto:`.
                 if (url.startsWith("mailto:")) {
                     // We use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
                     Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
@@ -380,6 +518,43 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 }
             }
 
+            // Block ads.  We have to use the deprecated `shouldInterceptRequest` until minimum API >= 21.
+            @SuppressWarnings("deprecation")
+            @Override
+            public WebResourceResponse shouldInterceptRequest(WebView view, String url){
+                if (adBlockerEnabled) {  // Block ads.
+                    // Extract the host from `url`.
+                    Uri requestUri = Uri.parse(url);
+                    String requestHost = requestUri.getHost();
+
+                    // Create a variable to track if this is an ad server.
+                    boolean requestHostIsAdServer = false;
+
+                    // Check all the subdomains of `requestHost` if it is not `null`.
+                    if (requestHost != null) {
+                        while (requestHost.contains(".")) {
+                            if (adServersSet.contains(requestHost)) {
+                                requestHostIsAdServer = true;
+                            }
+
+                            // Strip out the lowest subdomain of `requestHost`.
+                            requestHost = requestHost.substring(requestHost.indexOf(".") + 1);
+                        }
+                    }
+
+                    if (requestHostIsAdServer) {  // It is an ad server.
+                        // Return an empty `WebResourceResponse`.
+                        return new WebResourceResponse("text/plain", "utf8", new ByteArrayInputStream("".getBytes()));
+                    } else {  // It is not an ad server.
+                        // `return null` loads the requested resource.
+                        return null;
+                    }
+                } else {  // Ad blocking is disabled.
+                    // `return null` loads the requested resource.
+                    return null;
+                }
+            }
+
             // Update the URL in urlTextBox when the page starts to load.
             @Override
             public void onPageStarted(WebView view, String url, Bitmap favicon) {
@@ -446,38 +621,51 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             // Enter full screen video
             @Override
             public void onShowCustomView(View view, CustomViewCallback callback) {
-                appBar.hide();
-
-                // Show the fullScreenVideoFrameLayout.
-                fullScreenVideoFrameLayout.addView(view);
-                fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
+                // Pause the ad if this is the free flavor.
+                if (BuildConfig.FLAVOR.contentEquals("free")) {
+                    BannerAd.pauseAd(adView);
+                }
 
-                // Hide the mainWebView.
-                mainWebView.setVisibility(View.GONE);
+                // Remove the translucent overlays.
+                getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 
-                // Hide the ad if this is the free flavor.
-                BannerAd.hideAd(adView);
+                // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
+                drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
 
-                /* SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bars on the bottom or right of the screen.
-                 * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar across the top of the screen.
-                 * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the navigation and status bars ghosted overlays and automatically rehides them.
+                /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+                 * 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 rehides them after they are shown.
                  */
-                view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+                rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+
+                // Set `rootCoordinatorLayout` to fill the entire screen.
+                rootCoordinatorLayout.setFitsSystemWindows(false);
+
+                // Add `view` to `fullScreenVideoFrameLayout` and display it on the screen.
+                fullScreenVideoFrameLayout.addView(view);
+                fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
             }
 
             // Exit full screen video
             public void onHideCustomView() {
-                appBar.show();
+                // Hide `fullScreenVideoFrameLayout`.
+                fullScreenVideoFrameLayout.removeAllViews();
+                fullScreenVideoFrameLayout.setVisibility(View.GONE);
+
+                // Add the translucent status flag.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
+                getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 
-                // Show the mainWebView.
-                mainWebView.setVisibility(View.VISIBLE);
+                // Set `rootCoordinatorLayout` to fit inside the status and navigation bars.  This also clears the `SYSTEM_UI` flags.
+                rootCoordinatorLayout.setFitsSystemWindows(true);
 
                 // Show the ad if this is the free flavor.
-                BannerAd.showAd(adView);
+                if (BuildConfig.FLAVOR.contentEquals("free")) {
+                    // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
+                    BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
 
-                // Hide the fullScreenVideoFrameLayout.
-                fullScreenVideoFrameLayout.removeAllViews();
-                fullScreenVideoFrameLayout.setVisibility(View.GONE);
+                    // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
+                    adView = findViewById(R.id.adView);
+                }
             }
         });
 
@@ -506,7 +694,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
         // Replace the header that `WebView` creates for `X-Requested-With` with a null value.  The default value is the application ID (com.stoutner.privacybrowser.standard).
         customHeaders.put("X-Requested-With", "");
 
-        // Initialize the default preference values the first time the program is run.
+        // Initialize the default preference values the first time the program is run.  `this` is the context.  `false` keeps this command from resetting any current preferences back to default.
         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
 
         // Apply the settings from the shared preferences.
@@ -537,6 +725,9 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             favoriteIcon = favoriteIconBitmapDrawable.getBitmap();
         }
 
+        // Initialize `inFullScreenBrowsingMode`, which is always false at this point because Privacy Browser never starts in full screen browsing mode.
+        inFullScreenBrowsingMode = false;
+
         // Initialize AdView for the free flavor and request an ad.  If this is not the free flavor BannerAd.requestAd() does nothing.
         adView = findViewById(R.id.adView);
         BannerAd.requestAd(adView);
@@ -844,7 +1035,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             case R.id.clearFormData:
                 WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(this);
                 mainWebViewDatabase.clearFormData();
-                mainWebView.reload();
+                Snackbar.make(findViewById(R.id.mainWebView), R.string.form_data_deleted, Snackbar.LENGTH_SHORT).show();
                 return true;
 
             case R.id.fontSizeFiftyPercent:
@@ -877,11 +1068,9 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
 
             case R.id.find_on_page:
                 // Hide the URL app bar.
-                Toolbar appBarToolbar = (Toolbar) findViewById(R.id.appBar);
-                appBarToolbar.setVisibility(View.GONE);
+                supportAppBar.setVisibility(View.GONE);
 
                 // Show the Find on Page `RelativeLayout`.
-                LinearLayout findOnPageLinearLayout = (LinearLayout) findViewById(R.id.find_on_page_linearlayout);
                 findOnPageLinearLayout.setVisibility(View.VISIBLE);
 
                 // Display the keyboard.  We have to wait 200 ms before running the command to work around a bug in Android.
@@ -991,6 +1180,14 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 startActivity(settingsIntent);
                 break;
 
+            /*
+            case R.id.domains:
+                // Launch `DomainsList`.
+                Intent domainsIntent = new Intent(this, DomainsList.class);
+                startActivity(domainsIntent);
+                break;
+            */
+
             case R.id.guide:
                 // Launch `Guide`.
                 Intent guideIntent = new Intent(this, Guide.class);
@@ -1016,8 +1213,8 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 domStorage.deleteAllData();
 
                 // Clear form data.
-                WebViewDatabase formData = WebViewDatabase.getInstance(this);
-                formData.clearFormData();
+                WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(this);
+                webViewDatabase.clearFormData();
 
                 // Clear cache.  The argument of "true" includes disk files.
                 mainWebView.clearCache(true);
@@ -1035,12 +1232,20 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 customHeaders.clear();
 
                 // Detach all views from `mainWebViewRelativeLayout`.
-                RelativeLayout mainWebViewRelativeLayout = (RelativeLayout) findViewById(R.id.mainWebViewRelativeLayout);
                 mainWebViewRelativeLayout.removeAllViews();
 
                 // Destroy the internal state of `mainWebView`.
                 mainWebView.destroy();
 
+                // Manually delete the `app_webview` folder, which contains an additional `WebView` cache.  See `https://code.google.com/p/android/issues/detail?id=233826&thanks=233826&ts=1486670530`.
+                Runtime runtime = Runtime.getRuntime();
+                String dataDirString = getApplicationInfo().dataDir;  // `dataDir` will vary, but will be something like `/data/user/0/com.stoutner.privacybrowser.standard`, which links to `/data/data/com.stoutner.privacybrowser.standard`.
+                try {
+                    runtime.exec("rm -rf " + dataDirString + "/app_webview");
+                } catch (IOException e) {
+                    // Do nothing if the files do not exist.
+                }
+
                 // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
                 if (Build.VERSION.SDK_INT >= 21) {
                     finishAndRemoveTask();
@@ -1073,11 +1278,14 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
     public void onConfigurationChanged(Configuration newConfig) {
         super.onConfigurationChanged(newConfig);
 
-        // Reload the ad if this is the free flavor.
-        BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
+        // Reload the ad for the free flavor if we are not in full screen mode.
+        if (BuildConfig.FLAVOR.contentEquals("free") && adView.isShown() && !fullScreenVideoFrameLayout.isShown()) {
+            // Reload the ad.
+            BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
 
-        // Reinitialize the adView variable, as the View will have been removed and re-added in the free flavor by BannerAd.reloadAfterRotate().
-        adView = findViewById(R.id.adView);
+            // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
+            adView = findViewById(R.id.adView);
+        }
 
         // `invalidateOptionsMenu` should recalculate the number of action buttons from the menu to display on the app bar, but it doesn't because of the this bug:  https://code.google.com/p/android/issues/detail?id=20493#c8
         // ActivityCompat.invalidateOptionsMenu(this);
@@ -1092,6 +1300,9 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
         final String imageUrl;
         final String linkUrl;
 
+        // Get a handle for the `ClipboardManager`.
+        final ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
+
         switch (hitTestResult.getType()) {
             // `SRC_ANCHOR_TYPE` is a link.
             case WebView.HitTestResult.SRC_ANCHOR_TYPE:
@@ -1101,7 +1312,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 // Set the target URL as the title of the `ContextMenu`.
                 menu.setHeaderTitle(linkUrl);
 
-                // Add a `Load URL` button.
+                // Add a `Load URL` entry.
                 menu.add(R.string.load_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                     @Override
                     public boolean onMenuItemClick(MenuItem item) {
@@ -1110,7 +1321,20 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                     }
                 });
 
-                // Add a `Cancel` button, which by default closes the `ContextMenu`.
+                // Add a `Copy URL` entry.
+                menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
+                    @Override
+                    public boolean onMenuItemClick(MenuItem item) {
+                        // Save the link URL in a `ClipData`.
+                        ClipData srcAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), linkUrl);
+
+                        // Set the `ClipData` as the clipboard's primary clip.
+                        clipboardManager.setPrimaryClip(srcAnchorTypeClipData);
+                        return false;
+                    }
+                });
+
+                // Add a `Cancel` entry, which by default closes the `ContextMenu`.
                 menu.add(R.string.cancel);
                 break;
 
@@ -1121,7 +1345,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 // Set the target URL as the title of the `ContextMenu`.
                 menu.setHeaderTitle(linkUrl);
 
-                // Add a `Write Email` button.
+                // Add a `Write Email` entry.
                 menu.add(R.string.write_email).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                     @Override
                     public boolean onMenuItemClick(MenuItem item) {
@@ -1140,7 +1364,20 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                     }
                 });
 
-                // Add a `Cancel` button, which by default closes the `ContextMenu`.
+                // Add a `Copy Email Address` entry.
+                menu.add(R.string.copy_email_address).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
+                    @Override
+                    public boolean onMenuItemClick(MenuItem item) {
+                        // Save the email address in a `ClipData`.
+                        ClipData srcEmailTypeClipData = ClipData.newPlainText(getResources().getString(R.string.email_address), linkUrl);
+
+                        // Set the `ClipData` as the clipboard's primary clip.
+                        clipboardManager.setPrimaryClip(srcEmailTypeClipData);
+                        return false;
+                    }
+                });
+
+                // Add a `Cancel` entry, which by default closes the `ContextMenu`.
                 menu.add(R.string.cancel);
                 break;
 
@@ -1152,7 +1389,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 // Set the image URL as the title of the `ContextMenu`.
                 menu.setHeaderTitle(imageUrl);
 
-                // Add a `View Image` button.
+                // Add a `View Image` entry.
                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                     @Override
                     public boolean onMenuItemClick(MenuItem item) {
@@ -1161,7 +1398,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                     }
                 });
 
-                // Add a `Download Image` button.
+                // Add a `Download Image` entry.
                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                     @Override
                     public boolean onMenuItemClick(MenuItem item) {
@@ -1172,7 +1409,20 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                     }
                 });
 
-                // Add a `Cancel` button, which by default closes the `ContextMenu`.
+                // Add a `Copy URL` entry.
+                menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
+                    @Override
+                    public boolean onMenuItemClick(MenuItem item) {
+                        // Save the image URL in a `ClipData`.
+                        ClipData srcImageTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
+
+                        // Set the `ClipData` as the clipboard's primary clip.
+                        clipboardManager.setPrimaryClip(srcImageTypeClipData);
+                        return false;
+                    }
+                });
+
+                // Add a `Cancel` entry, which by default closes the `ContextMenu`.
                 menu.add(R.string.cancel);
                 break;
 
@@ -1185,7 +1435,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 // Set the image URL as the title of the `ContextMenu`.
                 menu.setHeaderTitle(imageUrl);
 
-                // Add a `View Image` button.
+                // Add a `View Image` entry.
                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                     @Override
                     public boolean onMenuItemClick(MenuItem item) {
@@ -1194,7 +1444,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                     }
                 });
 
-                // Add a `Download Image` button.
+                // Add a `Download Image` entry.
                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                     @Override
                     public boolean onMenuItemClick(MenuItem item) {
@@ -1205,7 +1455,20 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                     }
                 });
 
-                // Add a `Cancel` button, which by default closes the `ContextMenu`.
+                // Add a `Copy URL` entry.
+                menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
+                    @Override
+                    public boolean onMenuItemClick(MenuItem item) {
+                        // Save the image URL in a `ClipData`.
+                        ClipData srcImageAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
+
+                        // Set the `ClipData` as the clipboard's primary clip.
+                        clipboardManager.setPrimaryClip(srcImageAnchorTypeClipData);
+                        return false;
+                    }
+                });
+
+                // Add a `Cancel` entry, which by default closes the `ContextMenu`.
                 menu.add(R.string.cancel);
                 break;
         }
@@ -1232,66 +1495,95 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
 
     @Override
     public void onDownloadImage(AppCompatDialogFragment dialogFragment, String imageUrl) {
-        // Get a handle for the system `DOWNLOAD_SERVICE`.
-        DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
+        // Download the image if it has an HTTP or HTTPS URI.
+        if (imageUrl.startsWith("http")) {
+            // Get a handle for the system `DOWNLOAD_SERVICE`.
+            DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
 
-        // Parse `imageUrl`.
-        DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(imageUrl));
+            // Parse `imageUrl`.
+            DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(imageUrl));
 
-        // Get the file name from `dialogFragment`.
-        EditText downloadImageNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_image_name);
-        String imageName = downloadImageNameEditText.getText().toString();
+            // Pass cookies to download manager if cookies are enabled.  This is required to download images from websites that require a login.
+            if (firstPartyCookiesEnabled) {
+                // Get the cookies for `imageUrl`.
+                String cookies = cookieManager.getCookie(imageUrl);
 
-        // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
-        if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download save in the the `DIRECTORY_DOWNLOADS` using `imageName`.
-            downloadRequest.setDestinationInExternalFilesDir(this, "/", imageName);
-        } else { // Only set the title using `imageName`.
-            downloadRequest.setTitle(imageName);
-        }
+                // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
+                downloadRequest.addRequestHeader("Cookie", cookies);
+            }
+
+            // Get the file name from `dialogFragment`.
+            EditText downloadImageNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_image_name);
+            String imageName = downloadImageNameEditText.getText().toString();
 
-        // Allow `MediaScanner` to index the download if it is a media file.
-        downloadRequest.allowScanningByMediaScanner();
+            // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
+            if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download save in the the `DIRECTORY_DOWNLOADS` using `imageName`.
+                downloadRequest.setDestinationInExternalFilesDir(this, "/", imageName);
+            } else { // Only set the title using `imageName`.
+                downloadRequest.setTitle(imageName);
+            }
 
-        // Add the URL as the description for the download.
-        downloadRequest.setDescription(imageUrl);
+            // Allow `MediaScanner` to index the download if it is a media file.
+            downloadRequest.allowScanningByMediaScanner();
 
-        // Show the download notification after the download is completed.
-        downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+            // Add the URL as the description for the download.
+            downloadRequest.setDescription(imageUrl);
 
-        // Initiate the download.
-        downloadManager.enqueue(downloadRequest);
+            // Show the download notification after the download is completed.
+            downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+
+            // Initiate the download.
+            downloadManager.enqueue(downloadRequest);
+        } else {  // The image is not an HTTP or HTTPS URI.
+            Snackbar.make(mainWebView, R.string.cannot_download_image, Snackbar.LENGTH_INDEFINITE).show();
+        }
     }
 
     @Override
     public void onDownloadFile(AppCompatDialogFragment dialogFragment, String downloadUrl) {
-        // Get a handle for the system `DOWNLOAD_SERVICE`.
-        DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
+        // Download the file if it has an HTTP or HTTPS URI.
+        if (downloadUrl.startsWith("http")) {
 
-        // Parse `downloadUrl`.
-        DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(downloadUrl));
+            // Get a handle for the system `DOWNLOAD_SERVICE`.
+            DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
 
-        // Get the file name from `dialogFragment`.
-        EditText downloadFileNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_file_name);
-        String fileName = downloadFileNameEditText.getText().toString();
+            // Parse `downloadUrl`.
+            DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(downloadUrl));
 
-        // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
-        if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download save in the the `DIRECTORY_DOWNLOADS` using `fileName`.
-            downloadRequest.setDestinationInExternalFilesDir(this, "/", fileName);
-        } else { // Only set the title using `fileName`.
-            downloadRequest.setTitle(fileName);
-        }
+            // Pass cookies to download manager if cookies are enabled.  This is required to download files from websites that require a login.
+            if (firstPartyCookiesEnabled) {
+                // Get the cookies for `downloadUrl`.
+                String cookies = cookieManager.getCookie(downloadUrl);
+
+                // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
+                downloadRequest.addRequestHeader("Cookie", cookies);
+            }
+
+            // Get the file name from `dialogFragment`.
+            EditText downloadFileNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_file_name);
+            String fileName = downloadFileNameEditText.getText().toString();
 
-        // Allow `MediaScanner` to index the download if it is a media file.
-        downloadRequest.allowScanningByMediaScanner();
+            // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
+            if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download location to `/sdcard/Android/data/com.stoutner.privacybrowser.standard/files` named `fileName`.
+                downloadRequest.setDestinationInExternalFilesDir(this, "/", fileName);
+            } else { // Only set the title using `fileName`.
+                downloadRequest.setTitle(fileName);
+            }
+
+            // Allow `MediaScanner` to index the download if it is a media file.
+            downloadRequest.allowScanningByMediaScanner();
 
-        // Add the URL as the description for the download.
-        downloadRequest.setDescription(downloadUrl);
+            // Add the URL as the description for the download.
+            downloadRequest.setDescription(downloadUrl);
 
-        // Show the download notification after the download is completed.
-        downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+            // Show the download notification after the download is completed.
+            downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
 
-        // Initiate the download.
-        downloadManager.enqueue(downloadRequest);
+            // Initiate the download.
+            downloadManager.enqueue(downloadRequest);
+        } else {  // The download is not an HTTP or HTTPS URI.
+            Snackbar.make(mainWebView, R.string.cannot_download_file, Snackbar.LENGTH_INDEFINITE).show();
+        }
     }
 
     public void viewSslCertificate(View view) {
@@ -1322,11 +1614,9 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
         mainWebView.clearHistory();
     }
 
-    // Override onBackPressed to handle the navigation drawer and mainWebView.
+    // Override `onBackPressed` to handle the navigation drawer and `mainWebView`.
     @Override
     public void onBackPressed() {
-        final WebView mainWebView = (WebView) findViewById(R.id.mainWebView);
-
         // Close the navigation drawer if it is available.  GravityCompat.START is the drawer on the left on Left-to-Right layout text.
         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
             drawerLayout.closeDrawer(GravityCompat.START);
@@ -1335,7 +1625,7 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             if (mainWebView.canGoBack()) {
                 mainWebView.goBack();
             } else {
-                // Pass onBackPressed to the system.
+                // Pass `onBackPressed()` to the system.
                 super.onBackPressed();
             }
         }
@@ -1345,10 +1635,14 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
     public void onPause() {
         // Pause `mainWebView`.
         mainWebView.onPause();
+
+        // Stop all JavaScript.
         mainWebView.pauseTimers();
 
-        // We need to pause the adView or it will continue to consume resources in the background on the free flavor.
-        BannerAd.pauseAd(adView);
+        // Pause the adView or it will continue to consume resources in the background on the free flavor.
+        if (BuildConfig.FLAVOR.contentEquals("free")) {
+            BannerAd.pauseAd(adView);
+        }
 
         super.onPause();
     }
@@ -1357,12 +1651,16 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
     public void onResume() {
         super.onResume();
 
-        // Resume `mainWebView`.
+        // Resume JavaScript (if enabled).
         mainWebView.resumeTimers();
+
+        // Resume `mainWebView`.
         mainWebView.onResume();
 
-        // We need to resume the adView for the free flavor.
-        BannerAd.resumeAd(adView);
+        // Resume the adView for the free flavor.
+        if (BuildConfig.FLAVOR.contentEquals("free")) {
+            BannerAd.resumeAd(adView);
+        }
     }
 
     @Override
@@ -1443,12 +1741,10 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
         mainWebView.clearMatches();
 
         // Hide the Find on Page `RelativeLayout`.
-        LinearLayout findOnPageLinearLayout = (LinearLayout) findViewById(R.id.find_on_page_linearlayout);
         findOnPageLinearLayout.setVisibility(View.GONE);
 
         // Show the URL app bar.
-        Toolbar appBarToolbar = (Toolbar) findViewById(R.id.appBar);
-        appBarToolbar.setVisibility(View.VISIBLE);
+        supportAppBar.setVisibility(View.VISIBLE);
 
         // Hide the keyboard so we can see the webpage.  `0` indicates no additional flags.
         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
@@ -1459,17 +1755,26 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
         // Store the values from `sharedPreferences` in variables.
-        String userAgentString = sharedPreferences.getString("user_agent", "Default user agent");
+        String userAgentString = sharedPreferences.getString("user_agent", "PrivacyBrowser/1.0");
         String customUserAgentString = sharedPreferences.getString("custom_user_agent", "PrivacyBrowser/1.0");
         String javaScriptDisabledSearchString = sharedPreferences.getString("javascript_disabled_search", "https://duckduckgo.com/html/?q=");
-        String javaScriptDisabledCustomSearchString = sharedPreferences.getString("javascript_disabled_search_custom_url", "");
+        String javaScriptDisabledSearchCustomURLString = sharedPreferences.getString("javascript_disabled_search_custom_url", "");
         String javaScriptEnabledSearchString = sharedPreferences.getString("javascript_enabled_search", "https://duckduckgo.com/?q=");
-        String javaScriptEnabledCustomSearchString = sharedPreferences.getString("javascript_enabled_search_custom_url", "");
+        String javaScriptEnabledSearchCustomURLString = sharedPreferences.getString("javascript_enabled_search_custom_url", "");
         String homepageString = sharedPreferences.getString("homepage", "https://www.duckduckgo.com");
+        String torHomepageString = sharedPreferences.getString("tor_homepage", "https://3g2upl4pq6kufc4m.onion");
+        String torJavaScriptDisabledSearchString = sharedPreferences.getString("tor_javascript_disabled_search", "https://3g2upl4pq6kufc4m.onion/html/?q=");
+        String torJavaScriptDisabledSearchCustomURLString = sharedPreferences.getString("tor_javascript_disabled_search_custom_url", "");
+        String torJavaScriptEnabledSearchString = sharedPreferences.getString("tor_javascript_enabled_search", "https://3g2upl4pq6kufc4m.onion/?q=");
+        String torJavaScriptEnabledSearchCustomURLString = sharedPreferences.getString("tor_javascript_enabled_search_custom_url", "");
         String defaultFontSizeString = sharedPreferences.getString("default_font_size", "100");
         swipeToRefreshEnabled = sharedPreferences.getBoolean("swipe_to_refresh_enabled", false);
-        boolean doNotTrackEnabled = sharedPreferences.getBoolean("do_not_track", true);
+        adBlockerEnabled = sharedPreferences.getBoolean("block_ads", true);
+        boolean doNotTrackEnabled = sharedPreferences.getBoolean("do_not_track", false);
         boolean proxyThroughOrbot = sharedPreferences.getBoolean("proxy_through_orbot", false);
+        fullScreenBrowsingModeEnabled = sharedPreferences.getBoolean("enable_full_screen_browsing_mode", false);
+        hideSystemBarsOnFullscreen = sharedPreferences.getBoolean("hide_system_bars", false);
+        translucentNavigationBarOnFullscreen = sharedPreferences.getBoolean("translucent_navigation_bar", true);
 
         // Because they can be modified on-the-fly by the user, these default settings are only applied when the program first runs.
         if (javaScriptEnabled == null) {  // If `javaScriptEnabled` is null the program is just starting.
@@ -1493,8 +1798,50 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             }
         }
 
-        // Apply the other settings from `sharedPreferences`.
-        homepage = homepageString;
+        // Set the homepage, search, and proxy options.
+        if (proxyThroughOrbot) {  // Set the Tor options.
+            // Set `torHomepageString` as `homepage`.
+            homepage = torHomepageString;
+
+            // Set JavaScript disabled search.
+            if (torJavaScriptDisabledSearchString.equals("Custom URL")) {  // Get the custom URL string.
+                javaScriptDisabledSearchURL = torJavaScriptDisabledSearchCustomURLString;
+            } else {  // Use the string from the pre-built list.
+                javaScriptDisabledSearchURL = torJavaScriptDisabledSearchString;
+            }
+
+            // Set JavaScript enabled search.
+            if (torJavaScriptEnabledSearchString.equals("Custom URL")) {  // Get the custom URL string.
+                javaScriptEnabledSearchURL = torJavaScriptEnabledSearchCustomURLString;
+            } else {  // Use the string from the pre-built list.
+                javaScriptEnabledSearchURL = torJavaScriptEnabledSearchString;
+            }
+
+            // Set the proxy.  `this` refers to the current activity where an `AlertDialog` might be displayed.
+            OrbotProxyHelper.setProxy(getApplicationContext(), this, "localhost", "8118");
+        } else {  // Set the non-Tor options.
+            // Set `homepageString` as `homepage`.
+            homepage = homepageString;
+
+            // Set JavaScript disabled search.
+            if (javaScriptDisabledSearchString.equals("Custom URL")) {  // Get the custom URL string.
+                javaScriptDisabledSearchURL = javaScriptDisabledSearchCustomURLString;
+            } else {  // Use the string from the pre-built list.
+                javaScriptDisabledSearchURL = javaScriptDisabledSearchString;
+            }
+
+            // Set JavaScript enabled search.
+            if (javaScriptEnabledSearchString.equals("Custom URL")) {  // Get the custom URL string.
+                javaScriptEnabledSearchURL = javaScriptEnabledSearchCustomURLString;
+            } else {  // Use the string from the pre-built list.
+                javaScriptEnabledSearchURL = javaScriptEnabledSearchString;
+            }
+
+            // Reset the proxy to default.  The host is `""` and the port is `"0"`.
+            OrbotProxyHelper.setProxy(getApplicationContext(), this, "", "0");
+        }
+
+        // Set swipe to refresh.
         swipeRefreshLayout.setEnabled(swipeToRefreshEnabled);
 
         // Set the user agent initial status.
@@ -1515,20 +1862,6 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
                 break;
         }
 
-        // Set JavaScript disabled search.
-        if (javaScriptDisabledSearchString.equals("Custom URL")) {  // Get the custom URL string.
-            javaScriptDisabledSearchURL = javaScriptDisabledCustomSearchString;
-        } else {  // Use the string from the pre-built list.
-            javaScriptDisabledSearchURL = javaScriptDisabledSearchString;
-        }
-
-        // Set JavaScript enabled search.
-        if (javaScriptEnabledSearchString.equals("Custom URL")) {  // Get the custom URL string.
-            javaScriptEnabledSearchURL = javaScriptEnabledCustomSearchString;
-        } else {  // Use the string from the pre-built list.
-            javaScriptEnabledSearchURL = javaScriptEnabledSearchString;
-        }
-
         // Set Do Not Track status.
         if (doNotTrackEnabled) {
             customHeaders.put("DNT", "1");
@@ -1536,12 +1869,35 @@ public class MainWebView extends AppCompatActivity implements NavigationView.OnN
             customHeaders.remove("DNT");
         }
 
-        // Set Orbot proxy status.
-        if (proxyThroughOrbot) {
-            // Set the proxy.  `this` refers to the current activity where an `AlertDialog` might be displayed.
-            OrbotProxyHelper.setProxy(getApplicationContext(), this, "localhost", "8118");
-        } else {  // Reset the proxy to default.  The host is `""` and the port is `"0"`.
-            OrbotProxyHelper.setProxy(getApplicationContext(), this, "", "0");
+        // If we are in full screen mode update the `SYSTEM_UI` flags.
+        if (inFullScreenBrowsingMode) {
+            if (hideSystemBarsOnFullscreen) {  // Hide everything.
+                // Remove the translucent navigation setting if it is currently flagged.
+                getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+
+                // Remove the translucent status bar overlay.
+                getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+                // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
+                drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+
+                /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+                 * 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 rehides them after they are shown.
+                 */
+                rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+            } else {  // Hide everything except the status and navigation bars.
+                // Add the translucent status flag if it is unset.
+                getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+                if (translucentNavigationBarOnFullscreen) {
+                    // Set the navigation bar to be translucent.
+                    getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+                } else {
+                    // Set the navigation bar to be black.
+                    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+                }
+            }
         }
     }