Two-factor authentication with MailCheck for Firefox

You need the latest version of MailCheck in order to use two-factor authentication. You must first uninstall older versions.


The procedure described here is required only if you wish to use two-factor authentication with MailCheck for Firefox and you have already installed and use MailCheck.

  1. Click on the Menu button and then on Add-ons.

    Add-ons öffnen

  2. Select the Extensions category.
  3. Select MailCheck, click on the three dots and then click on Remove.
  4. Restart Firefox.
    You have removed the old version of MailCheck. In the next step, you must install the latest version.
  5. Navigate with Firefox to the MailCheck download page.
  6. Click on Activate for free.
  7. Depending on your security settings, Firefox will show you a prompt before installation - click on Allow, then on Install now.
  8. Click on Restart now.
Firefox will restart. Now, you can log in to and use two-factor authentication.

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