I came here for exactly this reason. I'm really surprised that Avast puts something this invasive into the software, AND that they have left it in here despite complaints.
Avast: Rather than annoying us with all of the sites that are OK, how about Just telling us about the sites that are NOT OK? I feel bad turning off protection that could be helpful. I just don't want to be nagged by it, or it's just as bad as the bad sites it aims to protect against. Really, what do bad sites do? Some of them install stuff that changes our user experience - uh, that's what we have here and people are uninstalling it.
C'mon folks, where's the common sense?