I've been using certificates in Firefox for several years. Now they are no longer in Firefox, and I cannot import them, neither authorities or personal.
When I import a *.cer certificate (authority) nothing happens.
When trying to import a personal certificate (*.p12, or *.pfx), after entering password, an error occurs: "The PKCS #12 operation failed for unknown reasons."
What can I do?
Thank you very much.