add: Components.returnCode = Components.results.NS_ERROR_NO_INTERFACE; return null; 
context:     QueryInterface: function(iid)    {        if (iid.equals(Components.interfaces.nsIURIContentListener) ||            iid.equals(Components.interfaces.nsISupportsWeakReference) ||            iid.equals(Components.interfaces.nsISupports))            return this;        throw Components.results.NS_NOINTERFACE;    },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/ea12a718a3bf4440ee1209cf6e73baf11af85c5b/nsBrowserContentListener.js/buggy/suite/browser/nsBrowserContentListener.js