We never got authorization from individuals to do that correlation.
We aren't perfect, but I think we do a pretty good job of respecting and protecting your privacy at Mozilla.
one industry norm that makes these things tough (again, not Mozilla's fault) is that at least under US law, Mozilla could change its privacy policies at some point in the future and do a lot more than it currently does.
and... my parent comment was brash and probably deserved the downvote it received.
(Disclosure: I work for Mozilla. I am helping write an updated set of privacy guidelines for engineering teams, to be as explicit as possible about how careful and respectful we need to be with data.)