The flake is unfortunately stuck on an old version (v2.0.0), since they changed how it's built with v2.1.0 and I haven't gotten around to fixing the flake, I'll try to see if I can get an update for it soon.
I use Qutebrowser which works well and is configurable, though there's no extensions which can be a bit of a bummer, but there's a built in adblocker which works pretty well at least.