2FAS Auth - Two factor authentication

Name: 2FAS Auth - Two factor authentication
Rating: 3.8313 (83 reviews)
Author: 2FAS

2FAS Auth Browser Extension is simple, private, and secured: one click, one tap, and your 2FA token is automatically entered!

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2FAS Auth Browser Extension offers a simple and secure way to handle two-factor authentication (2FA) codes. With just one click or tap, your 2FA token is automatically entered, eliminating manual input errors and saving time. The extension pairs seamlessly with the 2FAS Auth app on your phone, allowing instant verification for logging into any 2FA-enabled online service.

Set up is quick and easy: install the extension on your desktop browser, pair with your mobile app, and start enjoying faster, safer logins. 2FAS Auth supports Time-based (TOTP) and Event-based (HOTP) one-time passwords, enhancing security by generating codes offline that refresh every 30 seconds or per login. No account registration is required, ensuring privacy throughout your authentication process.

Add-on Privacy & Security Productivity Utilities

By:

2FAS

Daily users:

7,138 -36

Rating:

3.83

(83)

Version:

1.7.4 Last updated: 2025-05-05

Version code:

5942524

Creation date:

2022-06-22

Risk:

Permissions:

activeTab
tabs
storage
notifications
contextMenus
webNavigation

Size:

5.52M

Email:

su*****@2fas.com

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Browser Add-ons

Updated:

a day ago

Ranking

# 925 ▲ 10

Other rankings

#199 in Privacy & Security ▲ 1

#3 in mention keyword 1

#11 in author keyword 11

#11 in education keyword 9

#14 in fact keyword 11

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Other platforms

2FAS Auth - Two Factor Authentication (v1.7.4)

40,000 3.58

(107)

2FAS Auth - Two Factor Authentication (v1.7.4)

17,949 4.60

(17)

User reviews

Users appreciate the open-source nature and ability to export data, as well as better security by keeping tokens off the PC. It's seen as a good alternative after Authy's desktop app ended. However, many users complain that the extension requires manual phone approval every time, so it doesn't replace the phone in the 2FA process, leading to frustration. Some report persistent errors even after reinstalling, and many find the extension adds complexity rather than convenience.

Pros

Open source with data export allowing easy migration between apps.
Good for keeping 2FA tokens off the PC, adding an extra layer of security.
Useful replacement for Authy's discontinued desktop client.
Easy copying of OTP codes to websites via the extension trigger.
Maintains a secure flow preventing unauthorized access to OTPs on the computer.

Cons

Requires manual approval on the mobile app each time, not standalone on desktop.
Extension error messages persist despite reinstall, causing frustration.
Does not eliminate the need to use the phone, so fails to ease the 2FA workflow.
Users find it pointless since it still requires phone approval, creating extra steps.
Some users experience functionality issues where the extension doesn't work as expected.

Recent reviews

by Fi*****, 2025-05-28

by Ma*****, 2025-05-07

Pointless because I have to look at my phone anyway to approve the request.

by Or*****, 2025-05-05

View all user reviews ›

Extension safety

Risk impact

2FAS Auth - Two factor authentication requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

2FAS Auth - Two factor authentication is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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