If you want privacy, then the Tor browser wins, after that is mullvad, then a lot of Firefox forks, then firefox itself, then vanadium, then ungoogled chromium and maybe after that is brave.
Its somewhat decent I’m terms of security features in comparison to all the Firefox derivates, bit that’s simply cause its based on chromium.
Its only real feature is the ease of use which makes it a viable alternativ for non tech savy people that aren’t comfortable with the additional settup that the Firefox forks take to be on the same level.
Security wise Fairphone isn’t up to GOS standards, so a collaboration wasn’t on the table either way.
If said standards are reasonable is a difficult thing to say. A few years ago I would’ve said that a normal person doesn’t need to be concerned that the police tries to break into their phone, but with the current state of things and the increasing rise of fascism, I’m not so certain anymore.