IronFox:

https://gitlab.com/ironfox-oss/IronFox

Try IronFox maybe? It's a Mull fork

Fennec is still updated within a day of official update by the maintainer. It's usually the fdroid build process that takes a week or more to release the app.

F-Droid really need a priority based build workflow for security sensitive apps.

IronFox is what you're looking for, here's how you can add the repo to F-droid, or you can use the gitlab link another commenter posted to add it to Obtanium.

Waterfox is the outstanding choice due to its being performant and CROSS PLATFORM. Having it on Linux AND Android is a godsend!

https://www.waterfox.net/