I had a Firefox account with a primary and a secondary email address. A couple weeks ago I decide to delete this account using the Delete Account in the Firefox profile page (accounts.firefox.com -> settings -> profile -> Delete account button at the bottom). Then, I wanted to create a new profile with the secondary email address from the former (now is deleted) account. Surprisingly accounts.firefox.com thinks that the secondary email still in use, because I can't register with it. Even if I create a new account with some email, and I try to add the secondary email as secondary email, I get the error message, that "This email was already confirmed by another user". Which is not possible since I deleted the account. So, what can I do?