There is an add-on called "Data Selfie" on the Add-ons site (here), but it doesn't appear to be "featured." Was there a newsletter article on new privacy tools or something like that?

Hi what was the address that sent it ? In the headers is there a mozilla address ? Are you on a Mozilla/Firefox mailing list ?

I would doubt that it was sent by Mozilla but you could forward it provided the above is not in the headers to security@mozilla.org and ask.

You can also go to the add-on page and report it there : https://addons.mozilla.org/en-US/firefox/addon/dataselfie/

Message was from a Mozilla fellow, Hang Do Thi Duc, and the email was from Mozilla@e.mozilla.org