rem: .getService(Components.interfaces.nsIIOService); 
add: .getService(nsIIOService); 
context: function getURLSpecFromFile(aFile){  var ioServ = Components.classes["@mozilla.org/network/io-service;1"]                          .getService(Components.interfaces.nsIIOService);  var fph = ioServ.getProtocolHandler("file").QueryInterface(Components.interfaces.nsIFileProtocolHandler);  return fph.getURLSpecFromFile(aFile);}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/e70cc1872d3fa7a9c82c261be41c9d7d67b9d270/extensions.js/buggy/toolkit/mozapps/extensions/content/extensions.js