rem: return sidebar_file.URL; 
add:  var ioService = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);  return ioService.getURLSpecFromFile(sidebar_file); 
context: function get_sidebar_datasource_uri() {  try {    var sidebar_file = sidebar_get_panels_file();    return sidebar_file.URL;  } catch (ex) {    // This should not happen    debug("Error: Unable to load panels file.\n");  }  return null;}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/5ac5a63a0ef31b78035e13e9444b6730df46e6a3/sidebarOverlay.js/buggy/xpfe/components/sidebar/resources/sidebarOverlay.js