Can 2-factor authentication be used for the browser extension?

Yes, 2-factor authentication can be activated in the web and mobile app. It will then automatically be activated for the browser extension as well. If you trust your browser, you can also configure your settings so that the 2nd factor is only required when you log in to the specific browser for the first time. A secret key is then stored locally in the browser, which is automatically renewed before each new login. This can be reversed in the settings.