A good alternative is Mull available on F-Droid.
LibreWolf
Welcome to the official community for LibreWolf.
LibreWolf is designed to increase protection against tracking and fingerprinting techniques, while also including a few security improvements. LibreWolf also aims to remove all the telemetry, data collection and annoyances, as well as disabling anti-freedom features like DRM. If you have any question please visit our FAQ first: https://librewolf.net/docs/faq/
To learn more or to download the browser visit the website: https://librewolf.net/
If you want to contribute head over to our Codeberg: https://codeberg.org/librewolf
I use Mull too and it's a fantastic browser. I believe there are no plans to release Librewolf on Android.
Mull is super nice and its dev does a lot of good open source stuff, recommended!
What's your take on Fennec vs Mull?
Fennec is pretty much the same as Firefox in terms of compatibility. Mull makes many more privacy related changes that may break some websites.
The Mull browser on F-Droid is similar in concept (privacy-focused FF fork)