To be fair. Mozilla foundation is shady. They keep pushing things that don't follow their core mission. That try to expand their brand.
You can use Mozilla to build solid privacy respecting systems, but Firefox out of the box not so much. They're better than Google, but that's a low fucking bar.
Mullvad browser, Tor browser, mull for Android - all use the core Firefox open source engine, to make privacy respecting programs that work out of the box with privacy respecting defaults.
So I would say Mozilla is a good guy in this conversation, but not a saint.