Facts 1. I reset my desktop and needed to login from scratch. 2. I have 2 step authentication on 3. I forgot which authentication app I used for firefox 4. So I used email to login (or try to login anyways).. I requested several emails Problem 5. The EXACT same situation here (https://support.mozilla.org/en-US/questions/1356051#question-reply) happened to me: firefox claimed they were sending me emails, that had codes but didn't receive ANY email More facts: 6. I read the article cited in 5. And installed authy, and sure enough was able to login 7. I got multiple back up options to log in now (got plenty of emails now).. QUESTION: 8. Why did I get emails from 6. But not 4.? I suspect something is messed up on the security side of Firefox See image