UPDATE, March 3, 2025: This is not encouraging:

I’ve changed email a hundred times in the past few years. I don’t want to change browsers, too.
The interweb denizens are still sussing out Mozilla’s new Terms of Use (as in, they never had these before) for Firefox, but this seems…not good? Bold is provided by me, as are the gratuitous icons of spies.
You Give Mozilla Certain Rights and Permissions
You give Mozilla all rights necessary to operate Firefox, including processing data as we describe in the Firefox Privacy Notice, as well as acting on your behalf to help you navigate the internet. 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.
The language is just vague enough to put everyone on edge. We’ll see if Mozilla clarifies exactly what they mean by “help you navigate, experience, and interact with online content as you indicate with your use of Firefox”. Maybe it’s all innocent-like. Maybe.