Fennec!

It's basically just Firefox with some privacy upgrades like removed Mozilla telemetry. Available right on default FDroid repos.

You can install uBlock Origin natively into it. The full version. Grab Privacy Badger by the EFF while you're at it.

Plus by not using a Chromium browser you fight against Google's control over the web.

https://f-droid.org/en/packages/org.mozilla.fennec_fdroid/

IronFox has it's own repo and you can add uBlock origin

I'm running waterfox with ublock origin, would surprise me if that's not available there?

I use ironfox I think it may be from an added repository though.

Ironfox come with UBlock Origin installed. A word of caution - I always find that browser very slow loading pages.

If Brave interests you their fdroid repo is https://brave-browser-apk-release.s3.brave.com/fdroid/repo