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MailCheck is not displayed in Firefox

If GMX MailCheck is not visible or you accidentally hid it, you can show the extension again with a few clicks.

Cause

You accidentally hid or deactivated MailCheck.

Showing MailCheck

  1. Right-click a button on the toolbar.
  2. Click on GMX MailCheck.

Enabling MailCheck

  1. Click the menu button and then Add-ons.
  2. Select the Extensions category.
  3. Select the GMX MailCheck entry and click Enable.
  4. Restart Firefox.