rem:  this._os.removeObserver(this, "quit-application-granted"); 
context:   shutdown: function ()  {    var pbi = gPrefService.QueryInterface(Components.interfaces.nsIPrefBranchInternal);    pbi.removeObserver(this.promptDomain, this);    this._os.removeObserver(this, "quit-application-granted");  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/75bd6815ef86cac6d040aabea0f9409557b3d76e/browser.js/buggy/browser/base/content/browser.js