Fennec

Fennec is a build of Firefox’s source available through f droid. This allows installing Firefox without having to use the google play store.

Fennec comes with most, if not all, the features of Firefox. The F Droid page says " It’s focused on removing any proprietary bits found in official Mozilla’s builds." I haven’t noticed any missing features though. You can add extensions like u block origin.

Speed seems on par with other browsers.