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Delete MIT Personal Certificates in Firefox

WARNING: If you have used S/MIME for email encryption, you should export certificates, in order to retain a backup copy, before deleting them from the browser.
How can I tell if I've used S/MIME for email encryption?
  1. Open Firefox Preferences
    1. Open Preferences from the 3 bars in the upper right.
      firefox preferences

    2. Open Preferences from menu path:
      • On Windows: Tools > Options (or Firefox > Options)
      • On Linux: Edit > Preferences
      • On Mac OS X: Firefox > Preferences

  2. Select the Advanced pane. Then select the Certificates tab.
    firefox prefereences

  3. From Your Certificates, click View Certificates.
    firefox preferences

  4. Select the expired or duplicate certificate and click the Delete button. You will be prompted if you want to delete the certificate. Click OK to continue.
    firefox preferences

  5. Close and re-open Firefox, and confirm that you have one, non-expired certificate.

Note: You also want to empty your browser cache after deleting your certificate.

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

April 25, 2016

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