rem: return debuggr.onThrow(frame, rv); 
add: return debuggr.onThrow(frame, rv); 
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/2007/7450/2e2e6e5e5acba26e69243682fad1c16a0bea8a6a/firebug-service.js/buggy/extension/components/firebug-service.js