I use Avast as well, and the Windows Firewall - never had a problem with it. For some sites I prefer Firefox over Chrome and vice versa. I left the Norton world many years ago when I had huge problems with it. I think that was Norton 98? Something like that, haven't looked back. Mcafee was fine for a time, but then it got bloated as well, since then I've gone to other anti-virus pastures.