My original primary email is no longer functional, it was an ATT account compromised in a yahoo.com data breech some years ago. I was no longer an ATT customer at the time, so it would not let me log in to change my password. Now I want to remove it from firefox, and to do that I have to provide a confirmation code sent to that dead email account. Is there some other way to remove it and switch a current email address to my primary email?