rem: return ioService.getURLSpecFromFile(file); 
add: return fileHandler.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;      var ioService = XPCU.getService("@mozilla.org/network/io-service;1", "nsIIOService");      return ioService.getURLSpecFromFile(file);    } catch (ex) {      return null;    }  }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/c8bc7f67934b039af4b5b146ec2d2200958d3474/pref-sidebar.js/buggy/extensions/inspector/resources/content/prefs/pref-sidebar.js