add:  if (fbs.DBG_ERRORS) ddd("onThrow from "+frame.script.fileName+"@"+frame.line+": "+frame.pc+"\n"); 
context:     onThrow: function(frame, type, rv)    {        if ( isSystemURL(frame.script.fileName) )            return RETURN_CONTINUE_THROW;        // Remember the error where the last exception is thrown - this will        // be used later when the console service reports the error, since        // it doesn't currently report the window where the error occured        this._lastErrorWindow = getFrameWindow(frame);        var debuggr = this.findDebugger(frame);        if (debuggr)            return debuggr.onThrow(frame, rv);        return RETURN_CONTINUE_THROW;    },
meta: 7450	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7450/657c1059e813834f821277cbe0ed6b432bead8b9/firebug-service.js/buggy/extension/components/firebug-service.js