try 
try 
    getURLFromDebugger: function(callback, frame)    {           try        {            var url = callback(frame);            if (!url)            {                ERROR("firebug-service: debuggr callback for url failed \n");                return;            }            return url;        }        catch(exc)        {            if (fbs.DBG_ERRORS) dumpProperties("firebug-service: debuggr callback for url FAILED with exception=",exc);/*@explore*/            ERROR("firebug-service: debuggr callback for url FAILED with exception="+exc+"\n");        }    },
2454	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2454/4430f0c18a86cfa77637c382657dd43348a627ce/firebug-service.js/buggy/extension/components/firebug-service.js