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Been happily using Librewolf on my desktop for several months. No Android version as far as I can tell.
You can try mull, it’s developed by divestOS and is a “hardened” version of firefox without telemetry. Sadly, they have really big issue in building version 100 (firefox fault, addons doesn’t work), but hopefully they will solve the issue in the future. Remember to use ublock as an advanced user and switch JavaScript off by default
You could try Fennec