rem: return ioService.getURLSpecFromFile(sidebar_file); 
add: return fileHandler.getURLSpecFromFile(sidebar_file); 
context: function get_sidebar_datasource_uri() {  try {    var sidebar_file = sidebar_get_panels_file();        var ioService = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);        return ioService.getURLSpecFromFile(sidebar_file);  } catch (ex) {    // This should not happen    debug("Error: Unable to load panels file.\n");  }  return null;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/9f8db12489ca52b131e0014e2a580a663d497590/sidebarOverlay.js/clean/suite/common/sidebar/sidebarOverlay.js