if ( isSystemURL(frame.script.fileName) ) return RETURN_CONTINUE; 
if ( isSystemURL(frame.script.fileName) ) return RETURN_CONTINUE; 
        function interruptHook(frame, type, rv)        {        	if ( isSystemURL(frame.script.fileName) )        		return RETURN_CONTINUE;            // Sometimes the same line will have multiple interrupts, so check            // a unique id for the line and don't break until it changes            var frameLineId = hookFrameCount + frame.script.fileName + frame.line;			if (fbs.DBG_STEP) ddd("interruptHook frameLineId: "+frameLineId+"\n");                                     /*@explore*/            if (frameLineId != stepFrameLineId)                return fbs.onBreak(frame, type, rv);            else                return RETURN_CONTINUE;        }
2454	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2454/2e2e6e5e5acba26e69243682fad1c16a0bea8a6a/firebug-service.js/clean/extension/components/firebug-service.js