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I can see Mullvad taking over the "privacy browser" niche in the future thanks to Mullvad Browser and Tor Browser which they contribute to.

... which are soft forks of which browser? Firefox.

Yes. My point is that Mozilla are failing as stewards of Firefox, so I can see these two projects continuing their legacy.

You're completely underestimating the effort involved in maintaining a web browser. These forks are deliberately friendly.