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Thu, Apr 30, 2015 11:17 pm

Forgetting a certificate in Firefox

While using a MacBook Pro with Firefox ESR 31.6.0, I needed to have it "forget" a certificate for a website that I had it temporarily accept, because of an issue with the site's certificate. The process for doing so is as follows:
  1. In Firefox, click on the icon of three short horizontal bars at the upper, right-hand corner of the Firefox window, which will give you a menu where you should select Preferences.
  2. Select Advanced and click on the Certificates tab under it.

    Firefox - Advanced - Certificates

  3. Click on View Certificates.
  4. Click on the Servers tab.

    Firefox Certificate Manager - Servers

  5. Locate the server for which you wish to delete the certificate. It will have a lifetime value of "Permanent", if you permanently accepted it or a value of "Temporary", if you only temporarily accepted it. Click on it to highlight it, then click on the Delete button.
  6. You will then see a message asking "Are you sure you want to delete these server exceptions", which will show the server(s) you have selected and also note "If you delete a server exception, you restore the usual security checks for that server and require it uses a valid certficate." Click on OK. If you want to view the certificate before deleting it, you can click on the View button.
  7. Click on OK to close the Certificate Manager window. You can then close the Advanced window.

[/network/web/browser/firefox] permanent link

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