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How to resolve the inability to remove questionable certificates

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Using Preferences - Advanced - Encryption - View Certificates - Authorities - Delete or Distrust, I have been unable to remove any certificates. After selecting a given certificate (ie. turktrust, wells fargo, and many others that do not make any sense) and selecting delete; they have all reappeared. Following strange incidents as of late, it appears as though my computer has been hacked. Any advice?

Chosen solution

Firefox will remove the trust bits if you delete a build-in root certificate, but not remove the certificate.
If the trust bits are cleared then the certificate can no longer be used to build a certificate chain that ends with a root certificate, so this disables the certificate and blocks servers that use them.

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cor-el
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Chosen Solution

Firefox will remove the trust bits if you delete a build-in root certificate, but not remove the certificate.
If the trust bits are cleared then the certificate can no longer be used to build a certificate chain that ends with a root certificate, so this disables the certificate and blocks servers that use them.

Question owner

Thank you for your response and solution.