if (FBTrace.DBG_CREATION) ddd("FirebugService.shutdown\n"); 
    shutdown: function()    {        prefs.removeObserver("extensions.firebug", FirebugPrefsObserver);        timer = null;        fbs = null;        jsd = null;    },
2454	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2454/657c1059e813834f821277cbe0ed6b432bead8b9/firebug-service.js/clean/extension/components/firebug-service.js