Hi Firefox by default sends data about what features you use in Firefox to Leanplum, our mobile marketing vendor, which has its own [https://www.leanplum.com/privacy/ privacy policy]. Firefox by default sends data about what features you use in Firefox to Leanplum, our mobile marketing vendor, which has its own privacy policy. This data allows us to test different features and experiences, as well as provide customized messages and recommendations for improving your experience with Firefox. This data allows us to test different features and experiences, as well as provide customized messages and recommendations for improving your experience with Firefox. You can learn how to turn this off [https://support.mozilla.org/en-US/kb/send-usage-data-firefox-mobile-devices?redirectlocale=en-US&redirectslug=send-anonymous-usage-data-firefox-mobile-devices here].