I have CF +
@cruelsister ' settings (I just use Firewall and Auto-Containment... I don't use Viruscope, Website filtering, HIPs).
As CS once said time ago, any AV along with CF+CS' settings, it wont hurt, but it is (almost) a zero sum game.
In this context and based on this logic, if someone feels the need of having an AV with CF/CS, then the priority should be the highest compatibility & lowest system impact. And the winner is... AVAST FREE.
I tested lot of AV along with CF/CS. Most of them work perfectly along with CF/CS (almost zero compatibility problems).
But, in terms of system impact, AVAST FREE was unbeatable.
Yes, KFA and BDF etc may have the ultra-mega-best-interstellar-benchmarks. But again, along with CF/CS an AV is a zero sum game, and the priority should be compatibility/system performance.
I felt the psychological need of having an AV, so for the past 12 months I am using CF/CS & AVAST FREE... zero compatibility problems, and the lowest system impact.
For my browser (Firefox 60 beta), I completely blocked 3rd-parties (90% of websites work perfectly without them, and they represent 90% of the webgarbage/webrisks), I use Firefox built-in features (antimalware + anti-tracking protection + 3rd-parties cookies blocked), and very, very, very important: I also use Firefox FPI (First Party Isolation) + Containers.
During the past 12 months, despite my computer was attacked by phishing, scams, malwares etc... it never was infected. Once a month I ran Zemana and Hitman as second opinion scanner, and zero, 100% clean.
Conclusion: Zero malware problems, zero compatibility problems, almost zero system impact.