rem: return Components.classes[ progid ].createInstance( iid ); 
add: return Components.classes[ contractid ].createInstance( iid ); 
context:   function createInstance( progid, iidName ) {      var iid = Components.interfaces[iidName];      return Components.classes[ progid ].createInstance( iid );  }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/0257791053c2b38e1dfaf2ee11afae973e82e394/navigator.js/buggy/xpfe/browser/resources/content/navigator.js