> It is baffling why Firefox ships with this on by default.
Not really. The reason is that Mozilla wants to make money by selling your data/preferences. Probably so that the incompetent CEO can get even more obscene "compensation". They just bought a spyware adtech company.
It is net negative though.
It is more privacy-preserving to just not implement this in the first place.
It is baffling why Firefox ships with this on by default. Even Chrome prompted users with a (misleading) dialog box to turn it on or off.