The deeds speak more than the words, so I'm highly skeptical of their stance on privacy and attitude toward their users in general. I fail to see how it's any better than your average corporate "we highly value your privacy here at $corpName". Yes, of course, they aren't as obnoxious as Google or Facebook - spam and big data hoarding is not their business. But it's not that they're any particularly good, the world-wide enshittificaton just made us move the plank so much lower, that anyone not blatantly trying to make buck from anything they can touch is considered "good" those days.
Heck, modern Mozilla seem to be very comparable to Apple - both use the same themes of "oh look we're so pro-privacy (when it makes sense to us)", while becoming increasingly user-hostile and "knowing better". Apple aren't my friends, so aren't Mozilla - yet I'm practically forced to use and trust them, because the competition is no better or, typically, even worse (and tech is too convenient to forgo entirely).
The most obvious example - and my favorite pet peeve - is how they dealt with sync. They went the most typical corporate road - made their own unique system, extremely poorly designed (I've mentioned this a few times, it's exceptionally bad engineering), requiring an account with them, somewhat documented but with zero practical chances of being interoperable. And the ability to self-host and have a separate account wasn't anything more than an afterthought - I'm 99% sure it's there only because they needed to test against non-production servers, not because anyone cared about end users the slightest tiniest bit. If someone would've cared, and their voice would've been heard, the world would've been a somewhat better place - most likely, we would've had a simple (or, at least, sane) interoperable standard on storing and synchronizing browser data, and praised Mozilla for it, like in the old good days. That hadn't happened.
They sure had some ideals, but they lost the sight of them, yet they pretend they didn't.
And I'm sorry for those folks at Mozilla who have those ideals. I'm sure there are decent, good people there, who care and are passionate about what they do. But talking about the company as a whole, I can't say I'm happy to trust Mozilla - I do so begrudgingly. Their interests are certainly not aligned with mine.