From the new terms:
When you upload or input information through Firefox, you hereby grant us a nonexclusive, royalty-free, worldwide license to use that information to help you navigate, experience, and interact with online content as you indicate with your use of Firefox.
Honestly, if it was actually economically viable and made all bullshit go away, I’d happily pay for a browser.
I don’t think Mozilla could switch to that model without significant restructuring the likes of which they’ve little inventive to go for.