Customized firefox, zen browser, helium, and mullvad all with some kind of assortment of privacy extentions.

On Android, we got ironfox and cromite. most of the same privacy extentions are applicable.

If you want to use the tor network, go use the tor browser.

Frankly, I do not care that much that Mozilla makes most of its money from Google. I can change the search engine as the first thing I do and this fact simply stops affecting my experience negatively, especially on Firefox derivates.