In Firefox Options > Advanced > Encryption > View Certificates, locate and click each DigiNotar certificate, click "Edit Trust", all 3 items should not be checked.

• The certificates cannot be removed, but are disabled by having the 3 items under "Edit Trust" not checked.
• Compare to some other certificates by doing the same. There are others with all 3 items not checked, some with only one or two items checked.
• Do not change any with good knowledge and good reason to do so.

The certificates are also still in Windows, but are marked as Revoked.

If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.

All Edit Trust for DigiNotar are unchecked but the problem just reappeared.This did not fix it.

I repeat, you can not delete the certificates. If they are unchecked in "Edit Trust" they are disabled and will not be used.

If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.

What reappeared?

The invalid certificate appeared once, but after I went through all the diginotar certificates and made sure they were unchecked and then closed the certificate screen, the problem disappeared. Thanks for the help. I greatly appreciated it.

Do you need to access websites that are blocked by Firefox because the certificates are issued by DigiNotar?

not so far. Thanks again for your help.