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: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/e1400c9125f1ce96798a8c3ff2c3e918c4b7163a/browser.js/buggy/browser/base/content/browser.js