I’ve been told about Mull and fennec, but what about:
(From what I understand)
- Firefox Focus: blocks trackers and erases browsing history
- Firefox Nightly: new updates every night
- Firefox Klar: german version of focus
- Iceraven Browser: 3rd party fork with more add ons
If you think it is suspicious you should be able to spot it in the open source repository. Otherwise see the other, and probably only, reason for the different name.
Removed by mod
No, because they should be pretty much identical the only difference should be the name.