I’ve just updated the Avast program to 8.0.1489 from 8.0.1488 and it doesn’t appear to have addressed the WebRep toolbar icon issue reverting to the far right whenever Firefox is launched.

I should say WebRep still works correctly so what teakilla was talking about doesn’t appear to be connected the problem I’ve had. For me it is just a customisation/GUI problem nothing else. Still annoying though.