rem: dump("Error in QI: " + aIName + "\n" + ex); return null; 
add: throw("Unable to QI " + aEl + " to " + aIName); 
context:   QI: function(aEl, aIName)  {    try {      return aEl.QueryInterface(Components.interfaces[aIName]);    } catch (ex) {      dump("Error in QI: " + aIName + "\n" + ex);      return null;    }  }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/732dc6261a2ac11c9af2f33803020c5eb226df56/XPCU.js/buggy/extensions/inspector/resources/content/jsutil/xpcom/XPCU.js