Is ZA really worth using that much? Personally i think it is bloated and provides infinitely more headaches then it is worth. It was a good product 8 years ago but bad design decisions over the years have made it a crap product now.
There is no reason someone should have to give up FF4.0 for a third party security to update, that probably puts you are more risk.
I say ditch ZA, grab a consumer reports highly rated free AV, throw on threat fire or malwarebytes pro, and use WoT plugin for link scanning and you are set.