context:   toggleOfflineStatus: function ()  {    if (!this._canGoOffline()) {      this._updateOfflineUI(false);      return;    }    var ioService = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);    ioService.offline = !ioService.offline;        gPrefService.setBoolPref("browser.offline", ioService.offline);  },
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