f you lose your phones or otherwise can 't get codes via text, voice call, or Google Authenticator, you … If you don’t have your security key , you can also use these codes to sign in. After you ’ ve used a backup code to sign in, it will become inactive. … On your Android phone or tablet, open your device’s Settings app and then .
if you have a device still signed in to your account, you can use that device to disable two-factor authentication so you can log in to your account without two-factor authentication
If you do not have a paid account you are going to want to message a Forum Moderator. They can assist you in getting your account deleted. If you have a Paid account, contact support. I also suggest changing from what ever Authenticator app you where using to Authy which backs up and syncs your 2FA keys.
That’s exactly why you get recovery codes when you set up two factor authentication for your Firefox Account. So you can still log in case you lose your second factor.
Two-step authentication adds extra security to your Firefox account by making it harder for someone else to log in to your account. If you’ve gotten locked out of your two-step authentication login, you can use a recovery code to securely regain access to your account. Alternatively, if you have a device still signed in to your account, you can use that device to disable two-factor authentication so you can log in to your account without two-factor authentication.