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Showing content from https://support.mozilla.org/en-US/kb/secure-mozilla-account-two-step-authentication below:

Secure your Mozilla account with Two-Step Authentication

Two-step authentication, also known as two-factor authentication (2FA), adds an extra layer of security to your Mozilla account. Even if someone gets hold of your password, they won’t be able to access your account without a second factor of authentication. This second factor ensures that your account stays protected, even in the case of compromised credentials. By enabling 2FA, you greatly reduce the risk of unauthorized access, helping keep your personal data and browsing history safe.

How to set up two-step authentication
  1. Sign in to your Mozilla account and enable two-step authentication in the security section to enable this feature.
  2. Set up an authenticator app. Use a trusted app like Google Authenticator (Android, iOS & macOS) or Twilio Authy Authenticator (Android, iOS & macOS) to generate codes for signing in and be sure to download your backup authentication codes.
Recovery options for two-step authentication

If you lose access to your authenticator app or device, recovery methods ensure you can regain access to your account.

Backup authentication codes

When you set up 2FA, you’ll receive a set of 10-character backup authentication codes to save in a secure location. Each code can be used once to sign in to your account if you lose access to your authenticator app. Not to be confused with a recovery key (related to sync data recovery) or one-time codes sent by email or SMS.

Recovery phone

A new optional feature, initially available to users in the US and Canada, allows you to add a recovery phone number to your account. If you lose access to your authenticator app, you can request a one-time password (OTP) via SMS to regain access to your Mozilla account.

This feature is experimental and is being introduced to the Firefox user base through a progressive rollout. It may not yet be available to all users.

  1. Sign in to your Mozilla account and go to the security settings section.
  2. Add a phone number and verify it by entering the OTP sent to your phone.
Comparing recovery methods for two-step authentication Feature Backup authentication codes (Safest) Recovery phone Easiest Setup requirement Required and automatically provided during two-step authentication setup Manually add and verify phone number from account settings Availability Global Canada and USA only Usage One-time use per code One-time use per code Ease of access Requires access to pre-stored codes, risk of losing the codes Convenient if phone available, but requires active network connection Security Risk if codes lost or stored in unsecured location Vulnerable to SIM swap attack Understanding SIM swap risk

SIM swap attacks occur when a malicious actor convinces your mobile carrier to transfer your phone number to their SIM card. Once they have control of your phone number, they can intercept messages, including one-time passwords (OTPs), used for account recovery. This makes phone-based recovery methods more vulnerable than offline options like backup authentication codes.

To mitigate SIM swap risks, ensure your mobile carrier account is secured with a strong password and, if available, its own two-step authentication (2FA).

Most major cellular providers publish steps you can take to protect your devices on their help centers. You can find a few below.

Best practices for account security

By taking these steps, you’ll ensure your Mozilla account remains secure and protected from unauthorized access.

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