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Can't delete certificate authority

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Tools > Options > Certificates > View Certificates > Certificates Manager > Authorities

The "Delete or Distrust..." button does nothing. How do I delete a CA? I specifically wanted to delete the Turkish (TURKTRUST) cert.

FF v28.0

Tools > Options > Certificates > View Certificates > Certificates Manager > Authorities The "Delete or Distrust..." button does nothing. How do I delete a CA? I specifically wanted to delete the Turkish (TURKTRUST) cert. FF v28.0

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You can't remove (delete) built-in root certificates.
You can only remove all trust bits and that will prevent Firefox from using the certificate as root certificate.