Issue #303 Part 1: Move basilisk files from /browser to /application/basilisk

1 files changed, 667 insertions, 0 deletions

diff --git a/application/basilisk/components/preferences/in-content/main.js b/application/basilisk/components/preferences/in-content/main.js
new file mode 100644
index 000000000..bac771bec
--- /dev/null
+++ b/application/basilisk/components/preferences/in-content/main.js
@@ -0,0 +1,667 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import("resource://gre/modules/Downloads.jsm");
+Components.utils.import("resource://gre/modules/FileUtils.jsm");
+Components.utils.import("resource://gre/modules/Task.jsm");
+Components.utils.import("resource:///modules/ShellService.jsm");
+Components.utils.import("resource:///modules/TransientPrefs.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "OS",
+                                  "resource://gre/modules/osfile.jsm");
+
+var gMainPane = {
+  /**
+   * Initialization of this.
+   */
+  init: function ()
+  {
+    function setEventListener(aId, aEventType, aCallback)
+    {
+      document.getElementById(aId)
+              .addEventListener(aEventType, aCallback.bind(gMainPane));
+    }
+
+    if (AppConstants.HAVE_SHELL_SERVICE) {
+      this.updateSetDefaultBrowser();
+      if (AppConstants.platform == "win") {
+        // In Windows 8 we launch the control panel since it's the only
+        // way to get all file type association prefs. So we don't know
+        // when the user will select the default.  We refresh here periodically
+        // in case the default changes. On other Windows OS's defaults can also
+        // be set while the prefs are open.
+        window.setInterval(this.updateSetDefaultBrowser.bind(this), 1000);
+      }
+    }
+
+    // set up the "use current page" label-changing listener
+    this._updateUseCurrentButton();
+    window.addEventListener("focus", this._updateUseCurrentButton.bind(this), false);
+
+    this.updateBrowserStartupLastSession();
+
+    if (AppConstants.platform == "win") {
+      // Functionality for "Show tabs in taskbar" on Windows 7 and up.
+      try {
+        let sysInfo = Cc["@mozilla.org/system-info;1"].
+                      getService(Ci.nsIPropertyBag2);
+        let ver = parseFloat(sysInfo.getProperty("version"));
+        let showTabsInTaskbar = document.getElementById("showTabsInTaskbar");
+        showTabsInTaskbar.hidden = ver < 6.1;
+      } catch (ex) {}
+    }
+
+    // The "closing multiple tabs" and "opening multiple tabs might slow down
+    // &brandShortName;" warnings provide options for not showing these
+    // warnings again. When the user disabled them, we provide checkboxes to
+    // re-enable the warnings.
+    if (!TransientPrefs.prefShouldBeVisible("browser.tabs.warnOnClose"))
+      document.getElementById("warnCloseMultiple").hidden = true;
+    if (!TransientPrefs.prefShouldBeVisible("browser.tabs.warnOnOpen"))
+      document.getElementById("warnOpenMany").hidden = true;
+
+    setEventListener("browser.privatebrowsing.autostart", "change",
+                     gMainPane.updateBrowserStartupLastSession);
+    setEventListener("browser.download.dir", "change",
+                     gMainPane.displayDownloadDirPref);
+    if (AppConstants.HAVE_SHELL_SERVICE) {
+      setEventListener("setDefaultButton", "command",
+                       gMainPane.setDefaultBrowser);
+    }
+    setEventListener("useCurrent", "command",
+                     gMainPane.setHomePageToCurrent);
+    setEventListener("useBookmark", "command",
+                     gMainPane.setHomePageToBookmark);
+    setEventListener("restoreDefaultHomePage", "command",
+                     gMainPane.restoreDefaultHomePage);
+    setEventListener("chooseFolder", "command",
+                     gMainPane.chooseFolder);
+
+    if (AppConstants.MOZ_DEV_EDITION) {
+      let uAppData = OS.Constants.Path.userApplicationDataDir;
+      let ignoreSeparateProfile = OS.Path.join(uAppData, "ignore-dev-edition-profile");
+
+      setEventListener("separateProfileMode", "command", gMainPane.separateProfileModeChange);
+      let separateProfileModeCheckbox = document.getElementById("separateProfileMode");
+      setEventListener("getStarted", "click", gMainPane.onGetStarted);
+
+      OS.File.stat(ignoreSeparateProfile).then(() => separateProfileModeCheckbox.checked = false,
+                                               () => separateProfileModeCheckbox.checked = true);
+    }
+
+    // Notify observers that the UI is now ready
+    Components.classes["@mozilla.org/observer-service;1"]
+              .getService(Components.interfaces.nsIObserverService)
+              .notifyObservers(window, "main-pane-loaded", null);
+  },
+
+  enableE10SChange: function ()
+  {
+    // **STUB**
+  },
+
+  separateProfileModeChange: function ()
+  {
+    if (AppConstants.MOZ_DEV_EDITION) {
+      function quitApp() {
+        Services.startup.quit(Ci.nsIAppStartup.eAttemptQuit |  Ci.nsIAppStartup.eRestartNotSameProfile);
+      }
+      function revertCheckbox(error) {
+        separateProfileModeCheckbox.checked = !separateProfileModeCheckbox.checked;
+        if (error) {
+          Cu.reportError("Failed to toggle separate profile mode: " + error);
+        }
+      }
+      function createOrRemoveSpecialDevEditionFile(onSuccess) {
+        let uAppData = OS.Constants.Path.userApplicationDataDir;
+        let ignoreSeparateProfile = OS.Path.join(uAppData, "ignore-dev-edition-profile");
+
+        if (separateProfileModeCheckbox.checked) {
+          OS.File.remove(ignoreSeparateProfile).then(onSuccess, revertCheckbox);
+        } else {
+          OS.File.writeAtomic(ignoreSeparateProfile, new Uint8Array()).then(onSuccess, revertCheckbox);
+        }
+      }
+
+      let separateProfileModeCheckbox = document.getElementById("separateProfileMode");
+      let button_index = confirmRestartPrompt(separateProfileModeCheckbox.checked,
+                                              0, false, true);
+      switch (button_index) {
+        case CONFIRM_RESTART_PROMPT_CANCEL:
+          revertCheckbox();
+          return;
+        case CONFIRM_RESTART_PROMPT_RESTART_NOW:
+          const Cc = Components.classes, Ci = Components.interfaces;
+          let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"]
+                             .createInstance(Ci.nsISupportsPRBool);
+          Services.obs.notifyObservers(cancelQuit, "quit-application-requested",
+                                        "restart");
+          if (!cancelQuit.data) {
+            createOrRemoveSpecialDevEditionFile(quitApp);
+            return;
+          }
+
+          // Revert the checkbox in case we didn't quit
+          revertCheckbox();
+          return;
+        case CONFIRM_RESTART_PROMPT_RESTART_LATER:
+          createOrRemoveSpecialDevEditionFile();
+          return;
+      }
+    }
+  },
+
+  onGetStarted: function (aEvent) {
+    if (AppConstants.MOZ_DEV_EDITION) {
+      const Cc = Components.classes, Ci = Components.interfaces;
+      let wm = Cc["@mozilla.org/appshell/window-mediator;1"]
+                  .getService(Ci.nsIWindowMediator);
+      let win = wm.getMostRecentWindow("navigator:browser");
+
+      if (win) {
+        let accountsTab = win.gBrowser.addTab("about:accounts?action=signin&entrypoint=dev-edition-setup");
+        win.gBrowser.selectedTab = accountsTab;
+      }
+    }
+  },
+
+  // HOME PAGE
+
+  /*
+   * Preferences:
+   *
+   * browser.startup.homepage
+   * - the user's home page, as a string; if the home page is a set of tabs,
+   *   this will be those URLs separated by the pipe character "|"
+   * browser.startup.page
+   * - what page(s) to show when the user starts the application, as an integer:
+   *
+   *     0: a blank page
+   *     1: the home page (as set by the browser.startup.homepage pref)
+   *     2: the last page the user visited (DEPRECATED)
+   *     3: windows and tabs from the last session (a.k.a. session restore)
+   *
+   *   The deprecated option is not exposed in UI; however, if the user has it
+   *   selected and doesn't change the UI for this preference, the deprecated
+   *   option is preserved.
+   */
+
+  syncFromHomePref: function ()
+  {
+    let homePref = document.getElementById("browser.startup.homepage");
+
+    // If the pref is set to about:home or about:newtab, set the value to ""
+    // to show the placeholder text (about:home title) rather than
+    // exposing those URLs to users.
+    let defaultBranch = Services.prefs.getDefaultBranch("");
+    let defaultValue = defaultBranch.getComplexValue("browser.startup.homepage",
+                                                     Ci.nsIPrefLocalizedString).data;
+    let currentValue = homePref.value.toLowerCase();
+    if (currentValue == "about:home" ||
+        (currentValue == defaultValue && currentValue == "about:newtab")) {
+      return "";
+    }
+
+    // If the pref is actually "", show about:blank.  The actual home page
+    // loading code treats them the same, and we don't want the placeholder text
+    // to be shown.
+    if (homePref.value == "")
+      return "about:blank";
+
+    // Otherwise, show the actual pref value.
+    return undefined;
+  },
+
+  syncToHomePref: function (value)
+  {
+    // If the value is "", use about:home.
+    if (value == "")
+      return "about:home";
+
+    // Otherwise, use the actual textbox value.
+    return undefined;
+  },
+
+  /**
+   * Sets the home page to the current displayed page (or frontmost tab, if the
+   * most recent browser window contains multiple tabs), updating preference
+   * window UI to reflect this.
+   */
+  setHomePageToCurrent: function ()
+  {
+    let homePage = document.getElementById("browser.startup.homepage");
+    let tabs = this._getTabsForHomePage();
+    function getTabURI(t) {
+      return t.linkedBrowser.currentURI.spec;
+    }
+
+    // FIXME Bug 244192: using dangerous "|" joiner!
+    if (tabs.length)
+      homePage.value = tabs.map(getTabURI).join("|");
+  },
+
+  /**
+   * Displays a dialog in which the user can select a bookmark to use as home
+   * page.  If the user selects a bookmark, that bookmark's name is displayed in
+   * UI and the bookmark's address is stored to the home page preference.
+   */
+  setHomePageToBookmark: function ()
+  {
+    var rv = { urls: null, names: null };
+    gSubDialog.open("chrome://browser/content/preferences/selectBookmark.xul",
+                    "resizable=yes, modal=yes", rv,
+                    this._setHomePageToBookmarkClosed.bind(this, rv));
+  },
+
+  _setHomePageToBookmarkClosed: function(rv, aEvent) {
+    if (aEvent.detail.button != "accept")
+      return;
+    if (rv.urls && rv.names) {
+      var homePage = document.getElementById("browser.startup.homepage");
+
+      // XXX still using dangerous "|" joiner!
+      homePage.value = rv.urls.join("|");
+    }
+  },
+
+  /**
+   * Switches the "Use Current Page" button between its singular and plural
+   * forms.
+   */
+  _updateUseCurrentButton: function () {
+    let useCurrent = document.getElementById("useCurrent");
+
+
+    let tabs = this._getTabsForHomePage();
+
+    if (tabs.length > 1)
+      useCurrent.label = useCurrent.getAttribute("label2");
+    else
+      useCurrent.label = useCurrent.getAttribute("label1");
+
+    // In this case, the button's disabled state is set by preferences.xml.
+    let prefName = "pref.browser.homepage.disable_button.current_page";
+    if (document.getElementById(prefName).locked)
+      return;
+
+    useCurrent.disabled = !tabs.length
+  },
+
+  _getTabsForHomePage: function ()
+  {
+    var win;
+    var tabs = [];
+
+    const Cc = Components.classes, Ci = Components.interfaces;
+    var wm = Cc["@mozilla.org/appshell/window-mediator;1"]
+                .getService(Ci.nsIWindowMediator);
+    win = wm.getMostRecentWindow("navigator:browser");
+
+    if (win && win.document.documentElement
+                  .getAttribute("windowtype") == "navigator:browser") {
+      // We should only include visible & non-pinned tabs
+
+      tabs = win.gBrowser.visibleTabs.slice(win.gBrowser._numPinnedTabs);
+      tabs = tabs.filter(this.isNotAboutPreferences);
+    }
+
+    return tabs;
+  },
+
+  /**
+   * Check to see if a tab is not about:preferences
+   */
+  isNotAboutPreferences: function (aElement, aIndex, aArray)
+  {
+    return !aElement.linkedBrowser.currentURI.spec.startsWith("about:preferences");
+  },
+
+  /**
+   * Restores the default home page as the user's home page.
+   */
+  restoreDefaultHomePage: function ()
+  {
+    var homePage = document.getElementById("browser.startup.homepage");
+    homePage.value = homePage.defaultValue;
+  },
+
+  // DOWNLOADS
+
+  /*
+   * Preferences:
+   *
+   * browser.download.useDownloadDir - bool
+   *   True - Save files directly to the folder configured via the
+   *   browser.download.folderList preference.
+   *   False - Always ask the user where to save a file and default to
+   *   browser.download.lastDir when displaying a folder picker dialog.
+   * browser.download.dir - local file handle
+   *   A local folder the user may have selected for downloaded files to be
+   *   saved. Migration of other browser settings may also set this path.
+   *   This folder is enabled when folderList equals 2.
+   * browser.download.lastDir - local file handle
+   *   May contain the last folder path accessed when the user browsed
+   *   via the file save-as dialog. (see contentAreaUtils.js)
+   * browser.download.folderList - int
+   *   Indicates the location users wish to save downloaded files too.
+   *   It is also used to display special file labels when the default
+   *   download location is either the Desktop or the Downloads folder.
+   *   Values:
+   *     0 - The desktop is the default download location.
+   *     1 - The system's downloads folder is the default download location.
+   *     2 - The default download location is elsewhere as specified in
+   *         browser.download.dir.
+   * browser.download.downloadDir
+   *   deprecated.
+   * browser.download.defaultFolder
+   *   deprecated.
+   */
+
+  /**
+   * Enables/disables the folder field and Browse button based on whether a
+   * default download directory is being used.
+   */
+  readUseDownloadDir: function ()
+  {
+    var downloadFolder = document.getElementById("downloadFolder");
+    var chooseFolder = document.getElementById("chooseFolder");
+    var preference = document.getElementById("browser.download.useDownloadDir");
+    downloadFolder.disabled = !preference.value || preference.locked;
+    chooseFolder.disabled = !preference.value || preference.locked;
+
+    // don't override the preference's value in UI
+    return undefined;
+  },
+
+  /**
+   * Displays a file picker in which the user can choose the location where
+   * downloads are automatically saved, updating preferences and UI in
+   * response to the choice, if one is made.
+   */
+  chooseFolder()
+  {
+    return this.chooseFolderTask().catch(Components.utils.reportError);
+  },
+  chooseFolderTask: Task.async(function* ()
+  {
+    let bundlePreferences = document.getElementById("bundlePreferences");
+    let title = bundlePreferences.getString("chooseDownloadFolderTitle");
+    let folderListPref = document.getElementById("browser.download.folderList");
+    let currentDirPref = yield this._indexToFolder(folderListPref.value);
+    let defDownloads = yield this._indexToFolder(1);
+    let fp = Components.classes["@mozilla.org/filepicker;1"].
+             createInstance(Components.interfaces.nsIFilePicker);
+
+    fp.init(window, title, Components.interfaces.nsIFilePicker.modeGetFolder);
+    fp.appendFilters(Components.interfaces.nsIFilePicker.filterAll);
+    // First try to open what's currently configured
+    if (currentDirPref && currentDirPref.exists()) {
+      fp.displayDirectory = currentDirPref;
+    } // Try the system's download dir
+    else if (defDownloads && defDownloads.exists()) {
+      fp.displayDirectory = defDownloads;
+    } // Fall back to Desktop
+    else {
+      fp.displayDirectory = yield this._indexToFolder(0);
+    }
+
+    let result = yield new Promise(resolve => fp.open(resolve));
+    if (result != Components.interfaces.nsIFilePicker.returnOK) {
+      return;
+    }
+
+    let downloadDirPref = document.getElementById("browser.download.dir");
+    downloadDirPref.value = fp.file;
+    folderListPref.value = yield this._folderToIndex(fp.file);
+    // Note, the real prefs will not be updated yet, so dnld manager's
+    // userDownloadsDirectory may not return the right folder after
+    // this code executes. displayDownloadDirPref will be called on
+    // the assignment above to update the UI.
+  }),
+
+  /**
+   * Initializes the download folder display settings based on the user's
+   * preferences.
+   */
+  displayDownloadDirPref()
+  {
+    this.displayDownloadDirPrefTask().catch(Components.utils.reportError);
+
+    // don't override the preference's value in UI
+    return undefined;
+  },
+
+  displayDownloadDirPrefTask: Task.async(function* ()
+  {
+    var folderListPref = document.getElementById("browser.download.folderList");
+    var bundlePreferences = document.getElementById("bundlePreferences");
+    var downloadFolder = document.getElementById("downloadFolder");
+    var currentDirPref = document.getElementById("browser.download.dir");
+
+    // Used in defining the correct path to the folder icon.
+    var ios = Components.classes["@mozilla.org/network/io-service;1"]
+                        .getService(Components.interfaces.nsIIOService);
+    var fph = ios.getProtocolHandler("file")
+                 .QueryInterface(Components.interfaces.nsIFileProtocolHandler);
+    var iconUrlSpec;
+
+    // Display a 'pretty' label or the path in the UI.
+    if (folderListPref.value == 2) {
+      // Custom path selected and is configured
+      downloadFolder.label = this._getDisplayNameOfFile(currentDirPref.value);
+      iconUrlSpec = fph.getURLSpecFromFile(currentDirPref.value);
+    } else if (folderListPref.value == 1) {
+      // 'Downloads'
+      // In 1.5, this pointed to a folder we created called 'My Downloads'
+      // and was available as an option in the 1.5 drop down. On XP this
+      // was in My Documents, on OSX it was in User Docs. In 2.0, we did
+      // away with the drop down option, although the special label was
+      // still supported for the folder if it existed. Because it was
+      // not exposed it was rarely used.
+      // With 3.0, a new desktop folder - 'Downloads' was introduced for
+      // platforms and versions that don't support a default system downloads
+      // folder. See nsDownloadManager for details.
+      downloadFolder.label = bundlePreferences.getString("downloadsFolderName");
+      iconUrlSpec = fph.getURLSpecFromFile(yield this._indexToFolder(1));
+    } else {
+      // 'Desktop'
+      downloadFolder.label = bundlePreferences.getString("desktopFolderName");
+      iconUrlSpec = fph.getURLSpecFromFile(yield this._getDownloadsFolder("Desktop"));
+    }
+    downloadFolder.image = "moz-icon://" + iconUrlSpec + "?size=16";
+  }),
+
+  /**
+   * Returns the textual path of a folder in readable form.
+   */
+  _getDisplayNameOfFile: function (aFolder)
+  {
+    // TODO: would like to add support for 'Downloads on Macintosh HD'
+    //       for OS X users.
+    return aFolder ? aFolder.path : "";
+  },
+
+  /**
+   * Returns the Downloads folder.  If aFolder is "Desktop", then the Downloads
+   * folder returned is the desktop folder; otherwise, it is a folder whose name
+   * indicates that it is a download folder and whose path is as determined by
+   * the XPCOM directory service via the download manager's attribute
+   * defaultDownloadsDirectory.
+   *
+   * @throws if aFolder is not "Desktop" or "Downloads"
+   */
+  _getDownloadsFolder: Task.async(function* (aFolder)
+  {
+    switch (aFolder) {
+      case "Desktop":
+        var fileLoc = Components.classes["@mozilla.org/file/directory_service;1"]
+                                    .getService(Components.interfaces.nsIProperties);
+        return fileLoc.get("Desk", Components.interfaces.nsILocalFile);
+      case "Downloads":
+        let downloadsDir = yield Downloads.getSystemDownloadsDirectory();
+        return new FileUtils.File(downloadsDir);
+    }
+    throw "ASSERTION FAILED: folder type should be 'Desktop' or 'Downloads'";
+  }),
+
+  /**
+   * Determines the type of the given folder.
+   *
+   * @param   aFolder
+   *          the folder whose type is to be determined
+   * @returns integer
+   *          0 if aFolder is the Desktop or is unspecified,
+   *          1 if aFolder is the Downloads folder,
+   *          2 otherwise
+   */
+  _folderToIndex: Task.async(function* (aFolder)
+  {
+    if (!aFolder || aFolder.equals(yield this._getDownloadsFolder("Desktop")))
+      return 0;
+    else if (aFolder.equals(yield this._getDownloadsFolder("Downloads")))
+      return 1;
+    return 2;
+  }),
+
+  /**
+   * Converts an integer into the corresponding folder.
+   *
+   * @param   aIndex
+   *          an integer
+   * @returns the Desktop folder if aIndex == 0,
+   *          the Downloads folder if aIndex == 1,
+   *          the folder stored in browser.download.dir
+   */
+  _indexToFolder: Task.async(function* (aIndex)
+  {
+    switch (aIndex) {
+      case 0:
+        return yield this._getDownloadsFolder("Desktop");
+      case 1:
+        return yield this._getDownloadsFolder("Downloads");
+    }
+    var currentDirPref = document.getElementById("browser.download.dir");
+    return currentDirPref.value;
+  }),
+
+  /**
+   * Hide/show the "Show my windows and tabs from last time" option based
+   * on the value of the browser.privatebrowsing.autostart pref.
+   */
+  updateBrowserStartupLastSession: function()
+  {
+    let pbAutoStartPref = document.getElementById("browser.privatebrowsing.autostart");
+    let startupPref = document.getElementById("browser.startup.page");
+    let menu = document.getElementById("browserStartupPage");
+    let option = document.getElementById("browserStartupLastSession");
+    if (pbAutoStartPref.value) {
+      option.setAttribute("disabled", "true");
+      if (option.selected) {
+        menu.selectedItem = document.getElementById("browserStartupHomePage");
+      }
+    } else {
+      option.removeAttribute("disabled");
+      startupPref.updateElements(); // select the correct index in the startup menulist
+    }
+  },
+
+  // TABS
+
+  /*
+   * Preferences:
+   *
+   * browser.link.open_newwindow - int
+   *   Determines where links targeting new windows should open.
+   *   Values:
+   *     1 - Open in the current window or tab.
+   *     2 - Open in a new window.
+   *     3 - Open in a new tab in the most recent window.
+   * browser.tabs.loadInBackground - bool
+   *   True - Whether browser should switch to a new tab opened from a link.
+   * browser.tabs.warnOnClose - bool
+   *   True - If when closing a window with multiple tabs the user is warned and
+   *          allowed to cancel the action, false to just close the window.
+   * browser.tabs.warnOnOpen - bool
+   *   True - Whether the user should be warned when trying to open a lot of
+   *          tabs at once (e.g. a large folder of bookmarks), allowing to
+   *          cancel the action.
+   * browser.taskbar.previews.enable - bool
+   *   True - Tabs are to be shown in Windows 7 taskbar.
+   *   False - Only the window is to be shown in Windows 7 taskbar.
+   */
+
+  /**
+   * Determines where a link which opens a new window will open.
+   *
+   * @returns |true| if such links should be opened in new tabs
+   */
+  readLinkTarget: function() {
+    var openNewWindow = document.getElementById("browser.link.open_newwindow");
+    return openNewWindow.value != 2;
+  },
+
+  /**
+   * Determines where a link which opens a new window will open.
+   *
+   * @returns 2 if such links should be opened in new windows,
+   *          3 if such links should be opened in new tabs
+   */
+  writeLinkTarget: function() {
+    var linkTargeting = document.getElementById("linkTargeting");
+    return linkTargeting.checked ? 3 : 2;
+  },
+  /*
+   * Preferences:
+   *
+   * browser.shell.checkDefault
+   * - true if a default-browser check (and prompt to make it so if necessary)
+   *   occurs at startup, false otherwise
+   */
+
+  /**
+   * Show button for setting browser as default browser or information that
+   * browser is already the default browser.
+   */
+  updateSetDefaultBrowser: function()
+  {
+    if (AppConstants.HAVE_SHELL_SERVICE) {
+      let shellSvc = getShellService();
+      let defaultBrowserBox = document.getElementById("defaultBrowserBox");
+      if (!shellSvc) {
+        defaultBrowserBox.hidden = true;
+        return;
+      }
+      let setDefaultPane = document.getElementById("setDefaultPane");
+      let isDefault = shellSvc.isDefaultBrowser(false, true);
+      setDefaultPane.selectedIndex = isDefault ? 1 : 0;
+      let alwaysCheck = document.getElementById("alwaysCheckDefault");
+      alwaysCheck.disabled = alwaysCheck.disabled ||
+                             isDefault && alwaysCheck.checked;
+    }
+  },
+
+  /**
+   * Set browser as the operating system default browser.
+   */
+  setDefaultBrowser: function()
+  {
+    if (AppConstants.HAVE_SHELL_SERVICE) {
+      let alwaysCheckPref = document.getElementById("browser.shell.checkDefaultBrowser");
+      alwaysCheckPref.value = true;
+
+      let shellSvc = getShellService();
+      if (!shellSvc)
+        return;
+      try {
+        shellSvc.setDefaultBrowser(true, false);
+      } catch (ex) {
+        Cu.reportError(ex);
+        return;
+      }
+
+      let selectedIndex = shellSvc.isDefaultBrowser(false, true) ? 1 : 0;
+      document.getElementById("setDefaultPane").selectedIndex = selectedIndex;
+    }
+  },
+};