Gyl - FIREFOX IS NOT SUPPORTED - and apart from any other reason I may know that, it comes straight to me from someone at alwil software.
Eddy - I agree that while all files are scanned, and yes it would intercept malware etc., that's not what concerns me.
I would think the idea behind scripting is more to intercept pages that, during page loading, instead of installing malware, would use the scripting capabilities to execute system commands or run programs or something like that.
As for total system security, I totally agree, and whereas some people complain that on-access scanning slows apps or downloading of email or whatever, I willl happily put up with it knowing that I am protected from nasty viruses - and avast has done an admirable job so far.
And not only that, scripting can be a "vague" term too

lee - I'm sorry but I don't understand what you mean by "there's just no applicable interface to use"
But I will submit that if avast can script scan IE, Mozilla, and Netscape, I don't see why they can't do it for Firefox, especially considering, as I already stated, Netscape, Mozilla and Firefox all use the same rendering engine (GRE).
OOAT - beta4.5 seems great and I like that email scanning doesn't need special config anymore - great job