Not the parent but from F-Droid I use Fennec, which is FF nightly with the branding and some of the more obnoxious anti-features removed:

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

If you actually check the version numbers, it's actually the release version (instead of the nightly) with unofficial branding.

You are right, sorry! It's too late to edit my post but this is correct.

I recommend the fork Mull: https://f-droid.org/packages/us.spotco.fennec_dos/

It includes privacy-related improvements. See more: https://gitlab.com/divested-mobile/mull-fenix