rem: return file.URL; 
add:  var ioService = XPCU.getService("@mozilla.org/network/io-service;1", "nsIIOService");  return ioService.getURLSpecFromFile(file);  
context:   getDirectoryFile: function(aFileId)  {    try {      var dirService = XPCU.getService(kDirServiceCID, "nsIProperties");      var file = dirService.get(aFileId, Components.interfaces.nsIFile);      if (!file.exists())        return null;      return file.URL;    } catch (ex) {      return null;    }  }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/3d9e878c3473df2bdd78d84808b8168ac005e5aa/pref-sidebar.js/buggy/extensions/inspector/resources/content/prefs/pref-sidebar.js