FYI Mozilla / Firefox shares user data with Google, Leanplum, and Adjust  by default except on Klar  . Learn how to opt-out here . Also doesn't hurt to search for "telemetry" in `about:config` (not available on Firefox iOS) and toggle the entries to `false`.
@andreas I have read about some privacy issues in Klar too. (but I don't remember what and where 😩 )
@panos @andreas arf, just check the F-droid pageand it directly use the Fenix repo, there is no additional patching :'(
They actually say it's still using tracking, though I don't know what they refer too...
Personal instance of nitrohorse (nitrohorse.com).