So, for years, Mozilla has emailed me at an email address I don't remember signing up for an account with because, according to them, I'm an addon developer. Today, I finally found out why: these two addons. They're Washington Post addons for Chrome that I can only assume I was trying to get working on Firefox after Web Extensions support was added. Loving that it remembered my old name even after having to make a new account with that email address.
Anywho, thanks for this bit of fun, Mozilla. I'll be deleting these now.