mail.com MailCheck will be updated automatically at regular intervals. If you want to, you can also update MailCheck manually.
Using an outdated version of mail.com MailCheck could cause errors in the extension.
Generally, MailCheck automatically updates itself. In some cases however, you may have to update MailCheck manually.
Click the menu symbol and then click Add-ons.
This will open the Firefox Add-on Manager.
Right-click mail.com MailCheck.
A menu will appear.
Click Find Updates button.
If the message An update is available appears, click Update Now.