fxA

Firefox Accounts (FxA) is Mozilla’s identity and authentication platform. It provides centralized sign-in and single sign-on for Mozilla services and the Firefox browser, and functions as the authentication backbone for users across devices. FxA enables third-party applications and websites that adopt Mozilla’s account framework to authenticate users using their Firefox Account.

An FxA account is tied to an email address and a password, with additional security options such as two-factor authentication (2FA). FxA supports various 2FA methods, including hardware security keys via WebAuthn and time-based one-time passwords where supported. The platform underpins Firefox Sync, which synchronizes data such as bookmarks, passwords, history, and open tabs across devices that sign in with the same FxA account.

Security and privacy are central to FxA. Mozilla emphasizes data protection through encryption in transit and at rest where applicable and provides user controls for consent and data visibility. Mozilla’s privacy policy and transparency practices apply to FxA usage, and users can review and adjust account settings and recover access through standard account recovery processes.

FxA is maintained by Mozilla and incorporates open-source components. It has evolved since its initial release to support broader service integration and stronger authentication methods, while remaining focused on user privacy and control. It remains the primary identity layer for Mozilla’s online products.