Vault2FA is a lightweight and privacy-focused TOTP/HOTP authenticator built for Firefox. It generates one-time passwords (OTP) directly inside your browser, allowing you to securely access accounts protected by two-factor authentication. Vault2FA is local-first by design. Your secrets are stored locally in the browser and never leave your device unless you explicitly enable synchronization. Features

🔐 Local-first storage Your OTP secrets are stored locally by default. No cloud account or external service is required.
🔒 Optional encrypted storage Enable encryption for both local and sync data to protect your vault with a passphrase.
🔄 Optional sync sessions You can enable synchronization using a manually configured session ID. Sync is disabled by default and must be explicitly enabled. NOTE: it is strongly recommended to keep a local backup of your vault since Firefox Sync is designed only to sync add-on configurations, not secrets. Cloud sync therefore may have potential bugs. Cloud Sync is not available on Firefox mobile due to browser-side api restrictions.
📷 QR code scanning Add accounts quickly by scanning QR codes either from websites via right-click menu or uploading a local image.
⚡ Fast and lightweight popup Instantly access all your codes from the browser toolbar with a clean and responsive interface.
☀️🌙 Dark & Light theme supported Switch between themes to customize your experience.
📱 Full support for mobile devices Interface automatically scales on mobile devices. QR-Scanning page supports photos taken with camera.
🖊️ Auto filling 2fa input fields in pages Auto fill in your codes with customized URL matching rules with a in-page popup. You can disable this feature in Vault2FA's setting.
📥 Easy migration from popular authenticator apps Vault2FA supports migrating from Google Authenticator and Microsoft Authenticator. For detail, see Vault2FA--Migration.

Privacy Vault2FA is designed with privacy in mind: Secrets are stored locally by default. Synchronization uses Firefox Sync and is optional and user-controlled. No tracking, analytics, or external telemetry. Localization

🌏 Vault2FA now has full support for 简体中文 (zh-CN), English (en-US), Español (es-ES), Русский (ru-RU), Português (do Brasil) (pt-BR) and Português (pt-PT).
👬 We welcome and sincerely ask for community assistance for more languages in Vault2FA, as translating with AI may generate inaccuracy and misleading information. To support, visit Vault2FA's Github homepage, create a fork of the dev branch, upload your translated .lang into locales/ , then create a PR. After passing some basic reviews, your translation will be available in the nearest release. Remember to assign your name in the .lang file, so your contribution will be long honored ;D
🤖 We will still randomly update some translation using AI if we notice new user from different language environment.

Open Source Vault2FA is fully open source. Source code: https://github.com/DrJason33564/Vault2FA This add-on uses the source code from the following libraries. Acknowledgements: https://github.com/hectorm/otpauth https://github.com/cozmo/jsQR Permission Declaration 1.Vault2FA needs "Access your data for all websites" permission to auto fill in input fields in webpages. You can disable this feature in Vault2FA's setting. 2.Vault2FA will add an option to your right-click menu to scan in-page QR code images. You can disable this feature in Vault2FA's setting.