context: function SanitizeListener(){  var pbi = gPrefService.QueryInterface(Components.interfaces.nsIPrefBranchInternal);  pbi.addObserver(this.promptDomain, this, false);  this._setSanitizeItem();    if (gPrefService.prefHasUserValue(this.didSanitizeDomain))    gPrefService.clearUserPref(this.didSanitizeDomain)      this._os = Components.classes["@mozilla.org/observer-service;1"]                       .getService(Components.interfaces.nsIObserverService);  this._os.addObserver(this, "quit-application-granted", false);}
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