I'm not sure why you're being downvoted (unless Mozilla does indeed provide this information). All sites using Google Analytics are supposed to inform the user

I'm not sure why you're being downvoted (unless Mozilla does indeed provide this information). All sites using Google Analytics are supposed to inform the user according to Section 7 of the GA ToS: https://www.google.com/analytics/terms/us.html https://www.google.com/analytics/terms/us.html Just because "no one else does it" and Google turning a blind eye towards violators doesn't mean they're not violating the ToS.