My bad, bought out was the wrong way to word it- I should have said “Made partnerships with-” then listed Google and Yahoo(defunct), China and Russia.
If you watch this video discussing how privacy respect firefox is by default- www.youtube.com/watch?v=Fr8UFJzpNls you’ll see the telemetry they collect is miles long and Firefox is no better at protecting your privacy than Chrome/Chromium is whatsoever.
Definitely recommend Librewolf or Mullvad, which are actual privacy respecting browsers, even Chromium forks like Brave are better than default firefox.