URL:Mal

My computer have been fine so far .However,as i clicked on mozilla firefox today, i get an avast message.
the message says:

MALICIOUS URL BLOCKED

object:127.0.0.1/a/combo?metro/g/uicontrib/yui/substitue_3.3.0.js&metro/
infection:URL:Mal
action:blocked
process:c:\programme Files\Mozilla Firefox\firefox.exe

Anything wrong?i scanned with MBAM but got no results.

Thx in advance

Hello,
it is fixed in VPS 110420-1.

Milos