One funny thing about humans is that they aren't just gloriously fallible: they also get quite upset when that's pointed out. :)
Unfortunately, that's also how you end up with blameful company cultures that actively make reliability worse, because then your humans make just the same amounts of mistakes, but they hide them -- and you never get a chance to evolve your systems with the safeguards that would have prevented these.
Firefox's stance on privacy, like Apple's, is to some extent branding. Arguably it always was. You should still use Firefox (or any other third party browser) if it works for you. Ecosystem diversity matters.