They are transparent. Have a look at their privacy policy: https://www.mozilla.org/en-US/privacy/firefox/ https://www.mozilla.org/en-US/privacy/firefox/ It's si

They are transparent. Have a look at their privacy policy: https://www.mozilla.org/en-US/privacy/firefox/ https://www.mozilla.org/en-US/privacy/firefox/ It's simple, human-readable language, not even legalese.