context:   _canGoOffline: function ()  {    var os = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);    if (os) {      try {        var cancelGoOffline = Components.classes["@mozilla.org/supports-PRBool;1"].createInstance(Components.interfaces.nsISupportsPRBool);        os.notifyObservers(cancelGoOffline, "offline-requested", null);                // Something aborted the quit process.         if (cancelGoOffline.data)          return false;      }      catch (ex) {      }    }    return true;  },
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