avast not compatible with latest version of firefox

Is there an update or fix for this problem?

What compatibility issue with the latest version of firefox, my crystal ball got stolen ?

;D hahaha i cant resist to post. Sorry…

You should update your avast! to the latest and its will be compatible.

Well I have a sneaking suspicion I know what it is (WebRep, which works with the latest 6.0.1203 build)), but it can be dangerous to make assumptions.