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+/* 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/. */
+
+/* Auto-recovery module.
+ * This module aims to catch fatal browser initialization errors and either
+ * automatically correct likely causes from them, or automatically restarting
+ * the browser in safe mode. This is hooked into the browser's "onload"
+ * event because it can be assumed that at that point, everything must
+ * have been properly initialized already.
+ */
+
+let Cc = Components.classes;
+let Ci = Components.interfaces;
+let Cu = Components.utils;
+
+// Services = object with smart getters for common XPCOM services
+Cu.import("resource://gre/modules/Services.jsm");
+
+var browser_autoRecovery =
+{
+ onLoad: function() {
+
+ var nsIAS = Ci.nsIAppStartup; // Application startup interface
+
+ if (typeof gBrowser === "undefined") {
+ // gBrowser should always be defined at this point, but if it is not, then most likely
+ // it is due to an incompatible or outdated language pack being installed and selected.
+ // In this case, we reset "general.useragent.locale" to try to recover browser startup.
+ if (Services.prefs.prefHasUserValue("general.useragent.locale")) {
+ // Restart automatically in en-US.
+ Services.prefs.clearUserPref("general.useragent.locale");
+ Cc["@mozilla.org/toolkit/app-startup;1"].getService(nsIAS).quit(nsIAS.eRestart | nsIAS.eAttemptQuit);
+ } else if (!Services.appinfo.inSafeMode) {
+ // gBrowser isn't defined, and we're not using a custom locale. Most likely
+ // a user-installed add-on causes issues here, so we restart in Safe Mode.
+ let RISM = Services.prompt.confirm(null, "Error",
+ "The Browser didn't start properly!\n"+
+ "This is usually caused by an add-on or misconfiguration.\n\n"+
+ "Restart in Safe Mode?");
+ if (RISM) {
+ Cc["@mozilla.org/toolkit/app-startup;1"].getService(nsIAS).restartInSafeMode(nsIAS.eRestart | nsIAS.eAttemptQuit);
+ } else {
+ // Force quit application
+ Cc["@mozilla.org/toolkit/app-startup;1"].getService(nsIAS).quit(nsIAS.eForceQuit);
+ }
+ }
+ // Something else caused this issue and we're already in Safe Mode, so we return
+ // without doing anything else, and let normal error handling take place.
+ return;
+ } // gBrowser undefined
+
+ // Other checks than gBrowser undefined can go here!
+
+ // Remove our listener, since we don't want this to fire on every load.
+ window.removeEventListener("load", browser_autoRecovery.onLoad, false);
+ }
+};
+
+window.addEventListener("load", browser_autoRecovery.onLoad, false);