Made the switch to Fennec on Android, and Zen on my Linux desktop, which also has Windows and Mac versions. Sure, they’re forks of Firefox, but they are not subject to the same TOS. I used to use LibreWolf on my desktop but ended up having too many issues with it. Lots of crashing and instablility that regular Firefox just didn’t have.

Another great tool for unGoogled Android users is FFUpdater. It will handle updating of many open source (not just Firefox-based) browsers. You could also use something like Obtanium for something less browser-specific.