Mozilla is already revising its new Firefox terms to clarify how it handles user data

  News, Rassegna Stampa
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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.

https://www.theverge.com/news/622080/mozilla-revising-firefox-terms-of-use-data