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.
That’s the more vicious part of it. How do we know what this experience they want to serve us is. A more pessimistic read could be they sell everything we type to ad companies and claim targeted ads are totally enhancing our experience.