2FAS Auth - Two Factor Authentication Extension
2FAS Auth - Two Factor Authentication Extension is a browser helper for Safari that works with the 2FAS mobile app to fill one-time codes during sign-in.
What is 2FAS Auth - Two Factor Authentication Extension?
2FAS Auth - Two Factor Authentication Extension is a Safari browser extension for people who use 2FAS for two-factor authentication. It works together with the 2FAS mobile app to send a request from the browser to your phone when a website asks for a one-time code, then helps place the approved code into the sign-in field. This can make frequent logins faster and reduce manual code copying. The extension is designed for users who already manage TOTP or HOTP tokens in 2FAS and want the same workflow available in Safari on Mac. It is part of a broader 2FAS setup that also supports other browsers and keeps the phone as the place where approval happens.
Key features
- Request one-time authentication codes from the 2FAS mobile app while signing in
- Fill supported login code fields in Safari after you approve the request on your phone
- Pair a browser with your mobile device using the 2FAS setup flow
- Work with 2FA-protected websites that require TOTP or HOTP codes
- Use the extension without creating a separate account
- Support Safari as part of the wider 2FAS browser-extension workflow
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Safety overview
Status: Mostly safe
This extension is meant to interact with webpages where you sign in, so broad browser access can be normal for its purpose. It works with the 2FAS mobile app and may handle one-time authentication codes during login. Keep it if you use 2FAS in Safari and want faster code entry. If you no longer use 2FAS or do not want a browser extension with access to login pages, removing it is a reasonable choice.
Recommendation: Keep it if you use 2FAS for two-factor authentication in Safari, since removing it will disable the browser-assisted code workflow. If you do not use 2FAS on this Mac, you can uninstall the extension to reduce browser add-ons you do not need.
Common paths
~/Library/Containers/com.twofas.org.browser
Container paths
~/Library/Containers/com.twofas.org.browser
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