Rikj000

After a brief scroll through their source repo, I think it’s a set of patches which gets applied by a script while compiling the browser from source.

So it’s unlikely that it will be susceptible,
unless they forget to patch some telemetry out during a release, which is unlikely, since the projects goal is data privacy + security.

Fork of FireFox,
with a focus on data privacy + security:
https://librewolf.net/

I’d also like to add IronFox,
similar to LibreWolf, but for mobile:
https://gitlab.com/ironfox-oss/IronFox/