To Eddy :
I don't think so.
When I browse using Chrome,the number of URLs under web-shield keeps increasing.
When I browse using Firefox,it doesn't move.
I am not sure but,web-shield is URL based protection.It's like blacklist of harmful websites.
I hope we'll get awesome avast protection for firefox as well
To Filip :
Isn't it possible to merge firefox with avast without plugins ?
I guess there are other AV's that do without plugins.But,I don't wanna use any other.