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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 youve 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 .

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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

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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.

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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.

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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.