rem: var file_url = Components.classes["component: 
add: var file_url = Components.classes["@mozilla.org/network/standard-url;1"].createInstance(Components.interfaces.nsIFileURL); 
context: function get_sidebar_datasource_uri() {  try {    var sidebar_file = sidebar_get_panels_file();    var file_url = Components.classes["component://netscape/network/standard-url"].createInstance(Components.interfaces.nsIFileURL);    file_url.file = sidebar_file;    return file_url.spec;  } 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/2006/9421/6cc70ebd6c97bd0b2fe48c31f579e855387ced9d/sidebarOverlay.js/buggy/xpfe/components/sidebar/resources/sidebarOverlay.js