Firefox used to have a “we’re a browser that won’t sell user data” promise. Then they changed their TOS and removed the promise, adding:

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."

When people reacted to their TOS they said it was an accident, it’s just boilerplate, don’t take it seriously.

Or in other words: an entity with a team of lawyers claimed ownership of all your data, and then downplayed it, and then has acted good since.

Personally I stick my head way into the alligators mouth and still use Firefox.