/browser/base/content/browser.js

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# -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is mozilla.org code.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 1998
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Blake Ross <blake@cs.stanford.edu>
#   David Hyatt <hyatt@mozilla.org>
#   Peter Annema <disttsc@bart.nl>
#   Dean Tessman <dean_tessman@hotmail.com>
#   Kevin Puetz <puetzk@iastate.edu>
#   Ben Goodger <ben@netscape.com>
#   Pierre Chanial <chanial@noos.fr>
#   Jason Eager <jce2@po.cwru.edu>
#   Joe Hewitt <hewitt@netscape.com>
#   Alec Flett <alecf@netscape.com>
#   Asaf Romano <mozilla.mano@sent.com>
#   Jason Barnabe <jason_barnabe@fastmail.fm>
#   Peter Parente <parente@cs.unc.edu>
#   Giorgio Maone <g.maone@informaction.com>
#   Tom Germeau <tom.germeau@epigoon.com>
#   Jesse Ruderman <jruderman@gmail.com>
#   Joe Hughes <joe@retrovirus.com>
#   Pamela Greene <pamg.bugs@gmail.com>
#   Michael Ventnor <m.ventnor@gmail.com>
#   Simon Bünzli <zeniko@gmail.com>
#   Johnathan Nightingale <johnath@mozilla.com>
#   Ehsan Akhgari <ehsan.akhgari@gmail.com>
#   Dão Gottwald <dao@mozilla.com>
#   Thomas K. Dyas <tdyas@zecador.org>
#   Edward Lee <edward.lee@engineering.uiuc.edu>
#   Paul O’Shannessy <paul@oshannessy.com>
#   Nils Maier <maierman@web.de>
#   Rob Arnold <robarnold@cmu.edu>
#   Dietrich Ayala <dietrich@mozilla.com>
#   Gavin Sharp <gavin@gavinsharp.com>
#   Justin Dolske <dolske@mozilla.com>
#   Rob Campbell <rcampbell@mozilla.com>
#   David Dahl <ddahl@mozilla.com>
#   Patrick Walton <pcwalton@mozilla.com>
#   Mihai Sucan <mihai.sucan@gmail.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

let Ci = Components.interfaces;
let Cu = Components.utils;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");

const nsIWebNavigation = Ci.nsIWebNavigation;

var gCharsetMenu = null;
var gLastBrowserCharset = null;
var gPrevCharset = null;
var gProxyFavIcon = null;
var gLastValidURLStr = "";
var gInPrintPreviewMode = false;
var gDownloadMgr = null;
var gContextMenu = null; // nsContextMenu instance
var gDelayedStartupTimeoutId;
var gStartupRan = false;

#ifndef XP_MACOSX
var gEditUIVisible = true;
#endif

[
  ["gBrowser",            "content"],
  ["gNavToolbox",         "navigator-toolbox"],
  ["gURLBar",             "urlbar"],
  ["gNavigatorBundle",    "bundle_browser"]
].forEach(function (elementGlobal) {
  var [name, id] = elementGlobal;
  window.__defineGetter__(name, function () {
    var element = document.getElementById(id);
    if (!element)
      return null;
    delete window[name];
    return window[name] = element;
  });
  window.__defineSetter__(name, function (val) {
    delete window[name];
    return window[name] = val;
  });
});

// Smart getter for the findbar.  If you don't wish to force the creation of
// the findbar, check gFindBarInitialized first.
var gFindBarInitialized = false;
XPCOMUtils.defineLazyGetter(window, "gFindBar", function() {
  let XULNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
  let findbar = document.createElementNS(XULNS, "findbar");
  findbar.id = "FindToolbar";

  let browserBottomBox = document.getElementById("browser-bottombox");
  browserBottomBox.insertBefore(findbar, browserBottomBox.firstChild);

  // Force a style flush to ensure that our binding is attached.
  findbar.clientTop;
  findbar.browser = gBrowser;
  window.gFindBarInitialized = true;
  return findbar;
});

__defineGetter__("gPrefService", function() {
  delete this.gPrefService;
  return this.gPrefService = Services.prefs;
});

__defineGetter__("AddonManager", function() {
  Cu.import("resource://gre/modules/AddonManager.jsm");
  return this.AddonManager;
});
__defineSetter__("AddonManager", function (val) {
  delete this.AddonManager;
  return this.AddonManager = val;
});

__defineGetter__("PluralForm", function() {
  Cu.import("resource://gre/modules/PluralForm.jsm");
  return this.PluralForm;
});
__defineSetter__("PluralForm", function (val) {
  delete this.PluralForm;
  return this.PluralForm = val;
});

#ifdef MOZ_SERVICES_SYNC
XPCOMUtils.defineLazyGetter(this, "Weave", function() {
  let tmp = {};
  Cu.import("resource://services-sync/main.js", tmp);
  return tmp.Weave;
});
#endif

XPCOMUtils.defineLazyGetter(this, "PopupNotifications", function () {
  let tmp = {};
  Cu.import("resource://gre/modules/PopupNotifications.jsm", tmp);
  try {
    return new tmp.PopupNotifications(gBrowser,
                                      document.getElementById("notification-popup"),
                                      document.getElementById("notification-popup-box"));
  } catch (ex) {
    Cu.reportError(ex);
  }
});

let gInitialPages = [
  "about:blank",
  "about:privatebrowsing",
  "about:sessionrestore"
];

#include browser-fullZoom.js
#include inspector.js
#include browser-places.js
#include browser-tabPreviews.js
#include browser-tabview.js

#ifdef MOZ_SERVICES_SYNC
#include browser-syncui.js
#endif

XPCOMUtils.defineLazyGetter(this, "Win7Features", function () {
#ifdef XP_WIN
  const WINTASKBAR_CONTRACTID = "@mozilla.org/windows-taskbar;1";
  if (WINTASKBAR_CONTRACTID in Cc &&
      Cc[WINTASKBAR_CONTRACTID].getService(Ci.nsIWinTaskbar).available) {
    let temp = {};
    Cu.import("resource://gre/modules/WindowsPreviewPerTab.jsm", temp);
    let AeroPeek = temp.AeroPeek;
    return {
      onOpenWindow: function () {
        AeroPeek.onOpenWindow(window);
      },
      onCloseWindow: function () {
        AeroPeek.onCloseWindow(window);
      }
    };
  }
#endif
  return null;
});

#ifdef MOZ_CRASHREPORTER
XPCOMUtils.defineLazyServiceGetter(this, "gCrashReporter",
                                   "@mozilla.org/xre/app-info;1",
                                   "nsICrashReporter");
#endif

XPCOMUtils.defineLazyGetter(this, "PageMenu", function() {
  let tmp = {};
  Cu.import("resource://gre/modules/PageMenu.jsm", tmp);
  return new tmp.PageMenu();
});

/**
* We can avoid adding multiple load event listeners and save some time by adding
* one listener that calls all real handlers.
*/
function pageShowEventHandlers(event) {
  // Filter out events that are not about the document load we are interested in
  if (event.originalTarget == content.document) {
    charsetLoadListener(event);
    XULBrowserWindow.asyncUpdateUI();
  }
}

function UpdateBackForwardCommands(aWebNavigation) {
  var backBroadcaster = document.getElementById("Browser:Back");
  var forwardBroadcaster = document.getElementById("Browser:Forward");

  // Avoid setting attributes on broadcasters if the value hasn't changed!
  // Remember, guys, setting attributes on elements is expensive!  They
  // get inherited into anonymous content, broadcast to other widgets, etc.!
  // Don't do it if the value hasn't changed! - dwh

  var backDisabled = backBroadcaster.hasAttribute("disabled");
  var forwardDisabled = forwardBroadcaster.hasAttribute("disabled");
  if (backDisabled == aWebNavigation.canGoBack) {
    if (backDisabled)
      backBroadcaster.removeAttribute("disabled");
    else
      backBroadcaster.setAttribute("disabled", true);
  }

  if (forwardDisabled == aWebNavigation.canGoForward) {
    if (forwardDisabled)
      forwardBroadcaster.removeAttribute("disabled");
    else
      forwardBroadcaster.setAttribute("disabled", true);
  }
}

/**
 * Click-and-Hold implementation for the Back and Forward buttons
 * XXXmano: should this live in toolbarbutton.xml?
 */
function SetClickAndHoldHandlers() {
  var timer;

  function openMenu(aButton) {
    cancelHold(aButton);
    aButton.firstChild.hidden = false;
    aButton.open = true;
  }

  function mousedownHandler(aEvent) {
    if (aEvent.button != 0 ||
        aEvent.currentTarget.open ||
        aEvent.currentTarget.disabled)
      return;

    // Prevent the menupopup from opening immediately
    aEvent.currentTarget.firstChild.hidden = true;

    aEvent.currentTarget.addEventListener("mouseout", mouseoutHandler, false);
    aEvent.currentTarget.addEventListener("mouseup", mouseupHandler, false);
    timer = setTimeout(openMenu, 500, aEvent.currentTarget);
  }

  function mouseoutHandler(aEvent) {
    let buttonRect = aEvent.currentTarget.getBoundingClientRect();
    if (aEvent.clientX >= buttonRect.left &&
        aEvent.clientX <= buttonRect.right &&
        aEvent.clientY >= buttonRect.bottom)
      openMenu(aEvent.currentTarget);
    else
      cancelHold(aEvent.currentTarget);
  }

  function mouseupHandler(aEvent) {
    cancelHold(aEvent.currentTarget);
  }

  function cancelHold(aButton) {
    clearTimeout(timer);
    aButton.removeEventListener("mouseout", mouseoutHandler, false);
    aButton.removeEventListener("mouseup", mouseupHandler, false);
  }

  function clickHandler(aEvent) {
    if (aEvent.button == 0 &&
        aEvent.target == aEvent.currentTarget &&
        !aEvent.currentTarget.open &&
        !aEvent.currentTarget.disabled) {
      let cmdEvent = document.createEvent("xulcommandevent");
      cmdEvent.initCommandEvent("command", true, true, window, 0,
                                aEvent.ctrlKey, aEvent.altKey, aEvent.shiftKey,
                                aEvent.metaKey, null);
      aEvent.currentTarget.dispatchEvent(cmdEvent);
    }
  }

  function _addClickAndHoldListenersOnElement(aElm) {
    aElm.addEventListener("mousedown", mousedownHandler, true);
    aElm.addEventListener("click", clickHandler, true);
  }

  // Bug 414797: Clone unified-back-forward-button's context menu into both the
  // back and the forward buttons.
  var unifiedButton = document.getElementById("unified-back-forward-button");
  if (unifiedButton && !unifiedButton._clickHandlersAttached) {
    unifiedButton._clickHandlersAttached = true;

    let popup = document.getElementById("backForwardMenu").cloneNode(true);
    popup.removeAttribute("id");
    // Prevent the context attribute on unified-back-forward-button from being
    // inherited.
    popup.setAttribute("context", "");

    let backButton = document.getElementById("back-button");
    backButton.setAttribute("type", "menu");
    backButton.appendChild(popup);
    _addClickAndHoldListenersOnElement(backButton);

    let forwardButton = document.getElementById("forward-button");
    popup = popup.cloneNode(true);
    forwardButton.setAttribute("type", "menu");
    forwardButton.appendChild(popup);
    _addClickAndHoldListenersOnElement(forwardButton);
  }
}

const gSessionHistoryObserver = {
  observe: function(subject, topic, data)
  {
    if (topic != "browser:purge-session-history")
      return;

    var backCommand = document.getElementById("Browser:Back");
    backCommand.setAttribute("disabled", "true");
    var fwdCommand = document.getElementById("Browser:Forward");
    fwdCommand.setAttribute("disabled", "true");

    // Hide session restore button on about:home
    window.messageManager.sendAsyncMessage("Browser:HideSessionRestoreButton");

    if (gURLBar) {
      // Clear undo history of the URL bar
      gURLBar.editor.transactionManager.clear()
    }
  }
};

/**
 * Given a starting docshell and a URI to look up, find the docshell the URI
 * is loaded in.
 * @param   aDocument
 *          A document to find instead of using just a URI - this is more specific.
 * @param   aDocShell
 *          The doc shell to start at
 * @param   aSoughtURI
 *          The URI that we're looking for
 * @returns The doc shell that the sought URI is loaded in. Can be in
 *          subframes.
 */
function findChildShell(aDocument, aDocShell, aSoughtURI) {
  aDocShell.QueryInterface(Components.interfaces.nsIWebNavigation);
  aDocShell.QueryInterface(Components.interfaces.nsIInterfaceRequestor);
  var doc = aDocShell.getInterface(Components.interfaces.nsIDOMDocument);
  if ((aDocument && doc == aDocument) ||
      (aSoughtURI && aSoughtURI.spec == aDocShell.currentURI.spec))
    return aDocShell;

  var node = aDocShell.QueryInterface(Components.interfaces.nsIDocShellTreeNode);
  for (var i = 0; i < node.childCount; ++i) {
    var docShell = node.getChildAt(i);
    docShell = findChildShell(aDocument, docShell, aSoughtURI);
    if (docShell)
      return docShell;
  }
  return null;
}

var gPopupBlockerObserver = {
  _reportButton: null,
  
  onReportButtonClick: function (aEvent)
  {
    if (aEvent.button != 0 || aEvent.target != this._reportButton)
      return;

    document.getElementById("blockedPopupOptions")
            .openPopup(this._reportButton, "after_end", 0, 2, false, false, aEvent);
  },

  handleEvent: function (aEvent)
  {
    if (aEvent.originalTarget != gBrowser.selectedBrowser)
      return;

    if (!this._reportButton && gURLBar)
      this._reportButton = document.getElementById("page-report-button");

    if (!gBrowser.pageReport) {
      // Hide the icon in the location bar (if the location bar exists)
      if (gURLBar)
        this._reportButton.hidden = true;
      return;
    }

    if (gURLBar)
      this._reportButton.hidden = false;

    // Only show the notification again if we've not already shown it. Since
    // notifications are per-browser, we don't need to worry about re-adding
    // it.
    if (!gBrowser.pageReport.reported) {
      if (gPrefService.getBoolPref("privacy.popups.showBrowserMessage")) {
        var brandBundle = document.getElementById("bundle_brand");
        var brandShortName = brandBundle.getString("brandShortName");
        var message;
        var popupCount = gBrowser.pageReport.length;
#ifdef XP_WIN
        var popupButtonText = gNavigatorBundle.getString("popupWarningButton");
        var popupButtonAccesskey = gNavigatorBundle.getString("popupWarningButton.accesskey");
#else
        var popupButtonText = gNavigatorBundle.getString("popupWarningButtonUnix");
        var popupButtonAccesskey = gNavigatorBundle.getString("popupWarningButtonUnix.accesskey");
#endif
        if (popupCount > 1)
          message = gNavigatorBundle.getFormattedString("popupWarningMultiple", [brandShortName, popupCount]);
        else
          message = gNavigatorBundle.getFormattedString("popupWarning", [brandShortName]);

        var notificationBox = gBrowser.getNotificationBox();
        var notification = notificationBox.getNotificationWithValue("popup-blocked");
        if (notification) {
          notification.label = message;
        }
        else {
          var buttons = [{
            label: popupButtonText,
            accessKey: popupButtonAccesskey,
            popup: "blockedPopupOptions",
            callback: null
          }];

          const priority = notificationBox.PRIORITY_WARNING_MEDIUM;
          notificationBox.appendNotification(message, "popup-blocked",
                                             "chrome://browser/skin/Info.png",
                                             priority, buttons);
        }
      }

      // Record the fact that we've reported this blocked popup, so we don't
      // show it again.
      gBrowser.pageReport.reported = true;
    }
  },

  toggleAllowPopupsForSite: function (aEvent)
  {
    var pm = Services.perms;
    var shouldBlock = aEvent.target.getAttribute("block") == "true";
    var perm = shouldBlock ? pm.DENY_ACTION : pm.ALLOW_ACTION;
    pm.add(gBrowser.currentURI, "popup", perm);

    gBrowser.getNotificationBox().removeCurrentNotification();
  },

  fillPopupList: function (aEvent)
  {
    // XXXben - rather than using |currentURI| here, which breaks down on multi-framed sites
    //          we should really walk the pageReport and create a list of "allow for <host>"
    //          menuitems for the common subset of hosts present in the report, this will
    //          make us frame-safe.
    //
    // XXXjst - Note that when this is fixed to work with multi-framed sites,
    //          also back out the fix for bug 343772 where
    //          nsGlobalWindow::CheckOpenAllow() was changed to also
    //          check if the top window's location is whitelisted.
    var uri = gBrowser.currentURI;
    var blockedPopupAllowSite = document.getElementById("blockedPopupAllowSite");
    try {
      blockedPopupAllowSite.removeAttribute("hidden");

      var pm = Services.perms;
      if (pm.testPermission(uri, "popup") == pm.ALLOW_ACTION) {
        // Offer an item to block popups for this site, if a whitelist entry exists
        // already for it.
        let blockString = gNavigatorBundle.getFormattedString("popupBlock", [uri.host]);
        blockedPopupAllowSite.setAttribute("label", blockString);
        blockedPopupAllowSite.setAttribute("block", "true");
      }
      else {
        // Offer an item to allow popups for this site
        let allowString = gNavigatorBundle.getFormattedString("popupAllow", [uri.host]);
        blockedPopupAllowSite.setAttribute("label", allowString);
        blockedPopupAllowSite.removeAttribute("block");
      }
    }
    catch (e) {
      blockedPopupAllowSite.setAttribute("hidden", "true");
    }

    if (gPrivateBrowsingUI.privateBrowsingEnabled)
      blockedPopupAllowSite.setAttribute("disabled", "true");
    else
      blockedPopupAllowSite.removeAttribute("disabled");

    var foundUsablePopupURI = false;
    var pageReport = gBrowser.pageReport;
    if (pageReport) {
      for (var i = 0; i < pageReport.length; ++i) {
        // popupWindowURI will be null if the file picker popup is blocked.
        // xxxdz this should make the option say "Show file picker" and do it (Bug 590306) 
        if (!pageReport[i].popupWindowURI)
          continue;
        var popupURIspec = pageReport[i].popupWindowURI.spec;

        // Sometimes the popup URI that we get back from the pageReport
        // isn't useful (for instance, netscape.com's popup URI ends up
        // being "http://www.netscape.com", which isn't really the URI of
        // the popup they're trying to show).  This isn't going to be
        // useful to the user, so we won't create a menu item for it.
        if (popupURIspec == "" || popupURIspec == "about:blank" ||
            popupURIspec == uri.spec)
          continue;

        // Because of the short-circuit above, we may end up in a situation
        // in which we don't have any usable popup addresses to show in
        // the menu, and therefore we shouldn't show the separator.  However,
        // since we got past the short-circuit, we must've found at least
        // one usable popup URI and thus we'll turn on the separator later.
        foundUsablePopupURI = true;

        var menuitem = document.createElement("menuitem");
        var label = gNavigatorBundle.getFormattedString("popupShowPopupPrefix",
                                                        [popupURIspec]);
        menuitem.setAttribute("label", label);
        menuitem.setAttribute("popupWindowURI", popupURIspec);
        menuitem.setAttribute("popupWindowFeatures", pageReport[i].popupWindowFeatures);
        menuitem.setAttribute("popupWindowName", pageReport[i].popupWindowName);
        menuitem.setAttribute("oncommand", "gPopupBlockerObserver.showBlockedPopup(event);");
        menuitem.requestingWindow = pageReport[i].requestingWindow;
        menuitem.requestingDocument = pageReport[i].requestingDocument;
        aEvent.target.appendChild(menuitem);
      }
    }

    // Show or hide the separator, depending on whether we added any
    // showable popup addresses to the menu.
    var blockedPopupsSeparator =
      document.getElementById("blockedPopupsSeparator");
    if (foundUsablePopupURI)
      blockedPopupsSeparator.removeAttribute("hidden");
    else
      blockedPopupsSeparator.setAttribute("hidden", true);

    var blockedPopupDontShowMessage = document.getElementById("blockedPopupDontShowMessage");
    var showMessage = gPrefService.getBoolPref("privacy.popups.showBrowserMessage");
    blockedPopupDontShowMessage.setAttribute("checked", !showMessage);
    if (aEvent.target.anchorNode.id == "page-report-button") {
      aEvent.target.anchorNode.setAttribute("open", "true");
      blockedPopupDontShowMessage.setAttribute("label", gNavigatorBundle.getString("popupWarningDontShowFromLocationbar"));
    } else
      blockedPopupDontShowMessage.setAttribute("label", gNavigatorBundle.getString("popupWarningDontShowFromMessage"));
  },

  onPopupHiding: function (aEvent) {
    if (aEvent.target.anchorNode.id == "page-report-button")
      aEvent.target.anchorNode.removeAttribute("open");

    let item = aEvent.target.lastChild;
    while (item && item.getAttribute("observes") != "blockedPopupsSeparator") {
      let next = item.previousSibling;
      item.parentNode.removeChild(item);
      item = next;
    }
  },

  showBlockedPopup: function (aEvent)
  {
    var target = aEvent.target;
    var popupWindowURI = target.getAttribute("popupWindowURI");
    var features = target.getAttribute("popupWindowFeatures");
    var name = target.getAttribute("popupWindowName");

    var dwi = target.requestingWindow;

    // If we have a requesting window and the requesting document is
    // still the current document, open the popup.
    if (dwi && dwi.document == target.requestingDocument) {
      dwi.open(popupWindowURI, name, features);
    }
  },

  editPopupSettings: function ()
  {
    var host = "";
    try {
      host = gBrowser.currentURI.host;
    }
    catch (e) { }

    var bundlePreferences = document.getElementById("bundle_preferences");
    var params = { blockVisible   : false,
                   sessionVisible : false,
                   allowVisible   : true,
                   prefilledHost  : host,
                   permissionType : "popup",
                   windowTitle    : bundlePreferences.getString("popuppermissionstitle"),
                   introText      : bundlePreferences.getString("popuppermissionstext") };
    var existingWindow = Services.wm.getMostRecentWindow("Browser:Permissions");
    if (existingWindow) {
      existingWindow.initWithParams(params);
      existingWindow.focus();
    }
    else
      window.openDialog("chrome://browser/content/preferences/permissions.xul",
                        "_blank", "resizable,dialog=no,centerscreen", params);
  },

  dontShowMessage: function ()
  {
    var showMessage = gPrefService.getBoolPref("privacy.popups.showBrowserMessage");
    gPrefService.setBoolPref("privacy.popups.showBrowserMessage", !showMessage);
    gBrowser.getNotificationBox().removeCurrentNotification();
  }
};

const gXPInstallObserver = {
  _findChildShell: function (aDocShell, aSoughtShell)
  {
    if (aDocShell == aSoughtShell)
      return aDocShell;

    var node = aDocShell.QueryInterface(Components.interfaces.nsIDocShellTreeNode);
    for (var i = 0; i < node.childCount; ++i) {
      var docShell = node.getChildAt(i);
      docShell = this._findChildShell(docShell, aSoughtShell);
      if (docShell == aSoughtShell)
        return docShell;
    }
    return null;
  },

  _getBrowser: function (aDocShell)
  {
    for (var i = 0; i < gBrowser.browsers.length; ++i) {
      var browser = gBrowser.getBrowserAtIndex(i);
      if (this._findChildShell(browser.docShell, aDocShell))
        return browser;
    }
    return null;
  },

  observe: function (aSubject, aTopic, aData)
  {
    var brandBundle = document.getElementById("bundle_brand");
    var installInfo = aSubject.QueryInterface(Components.interfaces.amIWebInstallInfo);
    var win = installInfo.originatingWindow;
    var shell = win.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
                   .getInterface(Components.interfaces.nsIWebNavigation)
                   .QueryInterface(Components.interfaces.nsIDocShell);
    var browser = this._getBrowser(shell);
    if (!browser)
      return;
    const anchorID = "addons-notification-icon";
    var messageString, action;
    var brandShortName = brandBundle.getString("brandShortName");

    var notificationID = aTopic;
    // Make notifications persist a minimum of 30 seconds
    var options = {
      timeout: Date.now() + 30000
    };

    switch (aTopic) {
    case "addon-install-disabled":
      notificationID = "xpinstall-disabled"

      if (gPrefService.prefIsLocked("xpinstall.enabled")) {
        messageString = gNavigatorBundle.getString("xpinstallDisabledMessageLocked");
        buttons = [];
      }
      else {
        messageString = gNavigatorBundle.getString("xpinstallDisabledMessage");

        action = {
          label: gNavigatorBundle.getString("xpinstallDisabledButton"),
          accessKey: gNavigatorBundle.getString("xpinstallDisabledButton.accesskey"),
          callback: function editPrefs() {
            gPrefService.setBoolPref("xpinstall.enabled", true);
          }
        };
      }

      PopupNotifications.show(browser, notificationID, messageString, anchorID,
                              action, null, options);
      break;
    case "addon-install-blocked":
      messageString = gNavigatorBundle.getFormattedString("xpinstallPromptWarning",
                        [brandShortName, installInfo.originatingURI.host]);

      action = {
        label: gNavigatorBundle.getString("xpinstallPromptAllowButton"),
        accessKey: gNavigatorBundle.getString("xpinstallPromptAllowButton.accesskey"),
        callback: function() {
          installInfo.install();
        }
      };

      PopupNotifications.show(browser, notificationID, messageString, anchorID,
                              action, null, options);
      break;
    case "addon-install-started":
      function needsDownload(aInstall) {
        return aInstall.state != AddonManager.STATE_DOWNLOADED;
      }
      // If all installs have already been downloaded then there is no need to
      // show the download progress
      if (!installInfo.installs.some(needsDownload))
        return;
      notificationID = "addon-progress";
      messageString = gNavigatorBundle.getString("addonDownloading");
      messageString = PluralForm.get(installInfo.installs.length, messageString);
      options.installs = installInfo.installs;
      options.contentWindow = browser.contentWindow;
      options.sourceURI = browser.currentURI;
      options.eventCallback = function(aEvent) {
        if (aEvent != "removed")
          return;
        options.contentWindow = null;
        options.sourceURI = null;
      };
      PopupNotifications.show(browser, notificationID, messageString, anchorID,
                              null, null, options);
      break;
    case "addon-install-failed":
      // TODO This isn't terribly ideal for the multiple failure case
      installInfo.installs.forEach(function(aInstall) {
        var host = (installInfo.originatingURI instanceof Ci.nsIStandardURL) &&
                   installInfo.originatingURI.host;
        if (!host)
          host = (aInstall.sourceURI instanceof Ci.nsIStandardURL) &&
                 aInstall.sourceURI.host;

        var error = (host || aInstall.error == 0) ? "addonError" : "addonLocalError";
        if (aInstall.error != 0)
          error += aInstall.error;
        else if (aInstall.addon.blocklistState == Ci.nsIBlocklistService.STATE_BLOCKED)
          error += "Blocklisted";
        else
          error += "Incompatible";

        messageString = gNavigatorBundle.getString(error);
        messageString = messageString.replace("#1", aInstall.name);
        if (host)
          messageString = messageString.replace("#2", host);
        messageString = messageString.replace("#3", brandShortName);
        messageString = messageString.replace("#4", Services.appinfo.version);

        PopupNotifications.show(browser, notificationID, messageString, anchorID,
                                action, null, options);
      });
      break;
    case "addon-install-complete":
      var needsRestart = installInfo.installs.some(function(i) {
        return i.addon.pendingOperations != AddonManager.PENDING_NONE;
      });

      if (needsRestart) {
        messageString = gNavigatorBundle.getString("addonsInstalledNeedsRestart");
        action = {
          label: gNavigatorBundle.getString("addonInstallRestartButton"),
          accessKey: gNavigatorBundle.getString("addonInstallRestartButton.accesskey"),
          callback: function() {
            Application.restart();
          }
        };
      }
      else {
        messageString = gNavigatorBundle.getString("addonsInstalled");
        action = {
          label: gNavigatorBundle.getString("addonInstallManage"),
          accessKey: gNavigatorBundle.getString("addonInstallManage.accesskey"),
          callback: function() {
            // Calculate the add-on type that is most popular in the list of
            // installs
            var types = {};
            var bestType = null;
            installInfo.installs.forEach(function(aInstall) {
              if (aInstall.type in types)
                types[aInstall.type]++;
              else
                types[aInstall.type] = 1;
              if (!bestType || types[aInstall.type] > types[bestType])
                bestType = aInstall.type;
            });

            BrowserOpenAddonsMgr("addons://list/" + bestType);
          }
        };
      }

      messageString = PluralForm.get(installInfo.installs.length, messageString);
      messageString = messageString.replace("#1", installInfo.installs[0].name);
      messageString = messageString.replace("#2", installInfo.installs.length);
      messageString = messageString.replace("#3", brandShortName);

      // Remove notificaion on dismissal, since it's possible to cancel the
      // install through the addons manager UI, making the "restart" prompt
      // irrelevant.
      options.removeOnDismissal = true;

      PopupNotifications.show(browser, notificationID, messageString, anchorID,
                              action, null, options);
      break;
    }
  }
};

const gFormSubmitObserver = {
  QueryInterface : XPCOMUtils.generateQI([Ci.nsIFormSubmitObserver]),

  panel: null,

  init: function()
  {
    this.panel = document.getElementById('invalid-form-popup');
  },

  panelIsOpen: function()
  {
    return this.panel && this.panel.state != "hiding" &&
           this.panel.state != "closed";
  },

  notifyInvalidSubmit : function (aFormElement, aInvalidElements)
  {
    // We are going to handle invalid form submission attempt by focusing the
    // first invalid element and show the corresponding validation message in a
    // panel attached to the element.
    if (!aInvalidElements.length) {
      return;
    }

    // Don't show the popup if the current tab doesn't contain the invalid form.
    if (gBrowser.contentDocument !=
        aFormElement.ownerDocument.defaultView.top.document) {
      return;
    }

    let element = aInvalidElements.queryElementAt(0, Ci.nsISupports);

    if (!(element instanceof HTMLInputElement ||
          element instanceof HTMLTextAreaElement ||
          element instanceof HTMLSelectElement ||
          element instanceof HTMLButtonElement)) {
      return;
    }

    this.panel.firstChild.textContent = element.validationMessage;

    element.focus();

    // If the user interacts with the element and makes it valid or leaves it,
    // we want to remove the popup.
    // We could check for clicks but a click is already removing the popup.
    function blurHandler() {
      gFormSubmitObserver.panel.hidePopup();
    };
    function inputHandler(e) {
      if (e.originalTarget.validity.valid) {
        gFormSubmitObserver.panel.hidePopup();
      } else {
        // If the element is now invalid for a new reason, we should update the
        // error message.
        if (gFormSubmitObserver.panel.firstChild.textContent !=
            e.originalTarget.validationMessage) {
          gFormSubmitObserver.panel.firstChild.textContent =
            e.originalTarget.validationMessage;
        }
      }
    };
    element.addEventListener("input", inputHandler, false);
    element.addEventListener("blur", blurHandler, false);

    // One event to bring them all and in the darkness bind them.
    this.panel.addEventListener("popuphiding", function(aEvent) {
      aEvent.target.removeEventListener("popuphiding", arguments.callee, false);
      element.removeEventListener("input", inputHandler, false);
      element.removeEventListener("blur", blurHandler, false);
    }, false);

    this.panel.hidden = false;

    // We want to show the popup at the middle of checkbox and radio buttons
    // and where the content begin for the other elements.
    let offset = 0;
    let position = "";

    if (element.tagName == 'INPUT' &&
        (element.type == 'radio' || element.type == 'checkbox')) {
      position = "bottomcenter topleft";
    } else {
      let win = element.ownerDocument.defaultView;
      let style = win.getComputedStyle(element, null);
      let utils = win.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
                     .getInterface(Components.interfaces.nsIDOMWindowUtils);

      if (style.direction == 'rtl') {
        offset = parseInt(style.paddingRight) + parseInt(style.borderRightWidth);
      } else {
        offset = parseInt(style.paddingLeft) + parseInt(style.borderLeftWidth);
      }

      offset = Math.round(offset * utils.screenPixelsPerCSSPixel);

      position = "after_start";
    }

    this.panel.openPopup(element, position, offset, 0);
  }
};

// Simple gestures support
//
// As per bug #412486, web content must not be allowed to receive any
// simple gesture events.  Multi-touch gesture APIs are in their
// infancy and we do NOT want to be forced into supporting an API that
// will probably have to change in the future.  (The current Mac OS X
// API is undocumented and was reverse-engineered.)  Until support is
// implemented in the event dispatcher to keep these events as
// chrome-only, we must listen for the simple gesture events during
// the capturing phase and call stopPropagation on every event.

let gGestureSupport = {
  /**
   * Add or remove mouse gesture event listeners
   *
   * @param aAddListener
   *        True to add/init listeners and false to remove/uninit
   */
  init: function GS_init(aAddListener) {
    const gestureEvents = ["SwipeGesture",
      "MagnifyGestureStart", "MagnifyGestureUpdate", "MagnifyGesture",
      "RotateGestureStart", "RotateGestureUpdate", "RotateGesture",
      "TapGesture", "PressTapGesture"];

    let addRemove = aAddListener ? window.addEventListener :
      window.removeEventListener;

    gestureEvents.forEach(function (event) addRemove("Moz" + event, this, true),
                          this);
  },

  /**
   * Dispatch events based on the type of mouse gesture event. For now, make
   * sure to stop propagation of every gesture event so that web content cannot
   * receive gesture events.
   *
   * @param aEvent
   *        The gesture event to handle
   */
  handleEvent: function GS_handleEvent(aEvent) {
    aEvent.stopPropagation();

    // Create a preference object with some defaults
    let def = function(aThreshold, aLatched)
      ({ threshold: aThreshold, latched: !!aLatched });

    switch (aEvent.type) {
      case "MozSwipeGesture":
        aEvent.preventDefault();
        return this.onSwipe(aEvent);
      case "MozMagnifyGestureStart":
        aEvent.preventDefault();
#ifdef XP_WIN
        return this._setupGesture(aEvent, "pinch", def(25, 0), "out", "in");
#else
        return this._setupGesture(aEvent, "pinch", def(150, 1), "out", "in");
#endif
      case "MozRotateGestureStart":
        aEvent.preventDefault();
        return this._setupGesture(aEvent, "twist", def(25, 0), "right", "left");
      case "MozMagnifyGestureUpdate":
      case "MozRotateGestureUpdate":
        aEvent.preventDefault();
        return this._doUpdate(aEvent);
      case "MozTapGesture":
        aEvent.preventDefault();
        return this._doAction(aEvent, ["tap"]);
      case "MozPressTapGesture":
      // Fall through to default behavior
      return;
    }
  },

  /**
   * Called at the start of "pinch" and "twist" gestures to setup all of the
   * information needed to process the gesture
   *
   * @param aEvent
   *        The continual motion start event to handle
   * @param aGesture
   *        Name of the gesture to handle
   * @param aPref
   *        Preference object with the names of preferences and defaults
   * @param aInc
   *        Command to trigger for increasing motion (without gesture name)
   * @param aDec
   *        Command to trigger for decreasing motion (without gesture name)
   */
  _setupGesture: function GS__setupGesture(aEvent, aGesture, aPref, aInc, aDec) {
    // Try to load user-set values from preferences
    for (let [pref, def] in Iterator(aPref))
      aPref[pref] = this._getPref(aGesture + "." + pref, def);

    // Keep track of the total deltas and latching behavior
    let offset = 0;
    let latchDir = aEvent.delta > 0 ? 1 : -1;
    let isLatched = false;

    // Create the update function here to capture closure state
    this._doUpdate = function GS__doUpdate(aEvent) {
      // Update the offset with new event data
      offset += aEvent.delta;

      // Check if the cumulative deltas exceed the threshold
      if (Math.abs(offset) > aPref["threshold"]) {
        // Trigger the action if we don't care about latching; otherwise, make
        // sure either we're not latched and going the same direction of the
        // initial motion; or we're latched and going the opposite way
        let sameDir = (latchDir ^ offset) >= 0;
        if (!aPref["latched"] || (isLatched ^ sameDir)) {
          this._doAction(aEvent, [aGesture, offset > 0 ? aInc : aDec]);

          // We must be getting latched or leaving it, so just toggle
          isLatched = !isLatched;
        }

        // Reset motion counter to prepare for more of the same gesture
        offset = 0;
      }
    };

    // The start event also contains deltas, so handle an update right away
    this._doUpdate(aEvent);
  },

  /**
   * Generator producing the powerset of the input array where the first result
   * is the complete set and the last result (before StopIteration) is empty.
   *
   * @param aArray
   *        Source array containing any number of elements
   * @yield Array that is a subset of the input array from full set to empty
   */
  _power: function GS__power(aArray) {
    // Create a bitmask based on the length of the array
    let num = 1 << aArray.length;
    while (--num >= 0) {
      // Only select array elements where the current bit is set
      yield aArray.reduce(function (aPrev, aCurr, aIndex) {
        if (num & 1 << aIndex)
          aPrev.push(aCurr);
        return aPrev;
      }, []);
    }
  },

  /**
   * Determine what action to do for the gesture based on which keys are
   * pressed and which commands are set
   *
   * @param aEvent
   *        The original gesture event to convert into a fake click event
   * @param aGesture
   *        Array of gesture name parts (to be joined by periods)
   * @return Name of the command found for the event's keys and gesture. If no
   *         command is found, no value is returned (undefined).
   */
  _doAction: function GS__doAction(aEvent, aGesture) {
    // Create an array of pressed keys in a fixed order so that a command for
    // "meta" is preferred over "ctrl" when both buttons are pressed (and a
    // command for both don't exist)
    let keyCombos = [];
    ["shift", "alt", "ctrl", "meta"].forEach(function (key) {
      if (aEvent[key + "Key"])
        keyCombos.push(key);
    });

    // Try each combination of key presses in decreasing order for commands
    for each (let subCombo in this._power(keyCombos)) {
      // Convert a gesture and pressed keys into the corresponding command
      // action where the preference has the gesture before "shift" before
      // "alt" before "ctrl" before "meta" all separated by periods
      let command;
      try {
        command = this._getPref(aGesture.concat(subCombo).join("."));
      } catch (e) {}

      if (!command)
        continue;

      let node = document.getElementById(command);
      if (node) {
        if (node.getAttribute("disabled") != "true") {
          let cmdEvent = document.createEvent("xulcommandevent");
          cmdEvent.initCommandEvent("command", true, true, window, 0,
                                    aEvent.ctrlKey, aEvent.altKey, aEvent.shiftKey,
                                    aEvent.metaKey, null);
          node.dispatchEvent(cmdEvent);
        }
      } else {
        goDoCommand(command);
      }

      return command;
    }
    return null;
  },

  /**
   * Convert continual motion events into an action if it exceeds a threshold
   * in a given direction. This function will be set by _setupGesture to
   * capture state that needs to be shared across multiple gesture updates.
   *
   * @param aEvent
   *        The continual motion update event to handle
   */
  _doUpdate: function(aEvent) {},

  /**
   * Convert the swipe gesture into a browser action based on the direction
   *
   * @param aEvent
   *        The swipe event to handle
   */
  onSwipe: function GS_onSwipe(aEvent) {
    // Figure out which one (and only one) direction was triggered
    ["UP", "RIGHT", "DOWN", "LEFT"].forEach(function (dir) {
      if (aEvent.direction == aEvent["DIRECTION_" + dir])
        return this._doAction(aEvent, ["swipe", dir.toLowerCase()]);
    }, this);
  },

  /**
   * Get a gesture preference or use a default if it doesn't exist
   *
   * @param aPref
   *        Name of the preference to load under the gesture branch
   * @param aDef
   *        Default value if the preference doesn't exist
   */
  _getPref: function GS__getPref(aPref, aDef) {
    // Preferences branch under which all gestures preferences are stored
    const branch = "browser.gesture.";

    try {
      // Determine what type of data to load based on default value's type
      let type = typeof aDef;
      let getFunc = "get" + (type == "boolean" ? "Bool" :
                             type == "number" ? "Int" : "Char") + "Pref";
      return gPrefService[getFunc](branch + aPref);
    }
    catch (e) {
      return aDef;
    }
  },
};

function BrowserStartup() {
  var uriToLoad = null;

  // window.arguments[0]: URI to load (string), or an nsISupportsArray of
  //                      nsISupportsStrings to load, or a xul:tab of
  //                      a tabbrowser, which will be replaced by this
  //                      window (for this case, all other arguments are
  //                      ignored).
  //                 [1]: character set (string)
  //                 [2]: referrer (nsIURI)
  //                 [3]: postData (nsIInputStream)
  //                 [4]: allowThirdPartyFixup (bool)
  if ("arguments" in window && window.arguments[0])
    uriToLoad = window.arguments[0];

  var isLoadingBlank = uriToLoad == "about:blank";
  var mustLoadSidebar = false;

  prepareForStartup();

  if (uriToLoad && !isLoadingBlank) {
    if (uriToLoad instanceof Ci.nsISupportsArray) {
      let count = uriToLoad.Count();
      let specs = [];
      for (let i = 0; i < count; i++) {
        let urisstring = uriToLoad.GetElementAt(i).QueryInterface(Ci.nsISupportsString);
        specs.push(urisstring.data);
      }

      // This function throws for certain malformed URIs, so use exception handling
      // so that we don't disrupt startup
      try {
        gBrowser.loadTabs(specs, false, true);
      } catch (e) {}
    }
    else if (uriToLoad instanceof XULElement) {
      // swap the given tab with the default about:blank tab and then close
      // the original tab in the other window.

      // Stop the about:blank load
      gBrowser.stop();
      // make sure it has a docshell
      gBrowser.docShell;

      gBrowser.swapBrowsersAndCloseOther(gBrowser.selectedTab, uriToLoad);
    }
    else if (window.arguments.length >= 3) {
      loadURI(uriToLoad, window.arguments[2], window.arguments[3] || null,
              window.arguments[4] || false);
      content.focus();
    }
    // Note: loadOneOrMoreURIs *must not* be called if window.arguments.length >= 3.
    // Such callers expect that window.arguments[0] is handled as a single URI.
    else
      loadOneOrMoreURIs(uriToLoad);
  }

  if (window.opener && !window.opener.closed) {
    let openerSidebarBox = window.opener.document.getElementById("sidebar-box");
    // If the opener had a sidebar, open the same sidebar in our window.
    // The opener can be the hidden window too, if we're coming from the state
    // where no windows are open, and the hidden window has no sidebar box.
    if (openerSidebarBox && !openerSidebarBox.hidden) {
      let sidebarCmd = openerSidebarBox.getAttribute("sidebarcommand");
      let sidebarCmdElem = document.getElementById(sidebarCmd);

      // dynamically generated sidebars will fail this check.
      if (sidebarCmdElem) {
        let sidebarBox = document.getElementById("sidebar-box");
        let sidebarTitle = document.getElementById("sidebar-title");

        sidebarTitle.setAttribute(
          "value", window.opener.document.getElementById("sidebar-title").getAttribute("value"));
        sidebarBox.setAttribute("width", openerSidebarBox.boxObject.width);

        sidebarBox.setAttribute("sidebarcommand", sidebarCmd);
        // Note: we're setting 'src' on sidebarBox, which is a <vbox>, not on
        // the <browser id="sidebar">. This lets us delay the actual load until
        // delayedStartup().
        sidebarBox.setAttribute(
          "src", window.opener.document.getElementById("sidebar").getAttribute("src"));
        mustLoadSidebar = true;

        sidebarBox.hidden = false;
        document.getElementById("sidebar-splitter").hidden = false;
        sidebarCmdElem.setAttribute("checked", "true");
      }
    }
  }
  else {
    let box = document.getElementById("sidebar-box");
    if (box.hasAttribute("sidebarcommand")) {
      let commandID = box.getAttribute("sidebarcommand");
      if (commandID) {
        let command = document.getElementById(commandID);
        if (command) {
          mustLoadSidebar = true;
          box.hidden = false;
          document.getElementById("sidebar-splitter").hidden = false;
          command.setAttribute("checked", "true");
        }
        else {
          // Remove the |sidebarcommand| attribute, because the element it
          // refers to no longer exists, so we should assume this sidebar
          // panel has been uninstalled. (249883)
          box.removeAttribute("sidebarcommand");
        }
      }
    }
  }

  // Certain kinds of automigration rely on this notification to complete their
  // tasks BEFORE the browser window is shown.
  Services.obs.notifyObservers(null, "browser-window-before-show", "");

  // Set a sane starting width/height for all resolutions on new profiles.
  if (!document.documentElement.hasAttribute("width")) {
    let defaultWidth = 994;
    let defaultHeight;
    if (screen.availHeight <= 600) {
      document.documentElement.setAttribute("sizemode", "maximized");
      defaultWidth = 610;
      defaultHeight = 450;
    }
    else {
      // Create a narrower window for large or wide-aspect displays, to suggest
      // side-by-side page view.
      if (screen.availWidth >= 1600)
        defaultWidth = (screen.availWidth / 2) - 20;
      defaultHeight = screen.availHeight - 10;
#ifdef MOZ_WIDGET_GTK2
      // On X, we're not currently able to account for the size of the window
      // border.  Use 28px as a guess (titlebar + bottom window border)
      defaultHeight -= 28;
#endif
    }
    document.documentElement.setAttribute("width", defaultWidth);
    document.documentElement.setAttribute("height", defaultHeight);
  }

  if (!gShowPageResizers)
    document.getElementById("status-bar").setAttribute("hideresizer", "true");

  if (!window.toolbar.visible) {
    // adjust browser UI for popups
    if (gURLBar) {
      gURLBar.setAttribute("readonly", "true");
      gURLBar.setAttribute("enablehistory", "false");
    }
    goSetCommandEnabled("Browser:OpenLocation", false);
    goSetCommandEnabled("cmd_newNavigatorTab", false);
  }

#ifdef MENUBAR_CAN_AUTOHIDE
  updateAppButtonDisplay();
#endif

  CombinedStopReload.init();

  allTabs.readPref();

  TabsOnTop.syncCommand();

  BookmarksMenuButton.init();

  TabsInTitlebar.init();

  gPrivateBrowsingUI.init();

  retrieveToolbarIconsizesFromTheme();

  gDelayedStartupTimeoutId = setTimeout(delayedStartup, 0, isLoadingBlank, mustLoadSidebar);
  gStartupRan …