Whenever I try to import my client certificate to authenticate myself on certain websites from Internet explorer to Firefox, I receive an error box that has the message: "The PKCS #12 operation failed for unknown reasons." What a super helpful message. I've exported the certificate from Internet explorer including the private key into a PKCS #12 file. I've had a certificate that was successfully imported into Firefox in the past that I've tried to re-import as a test, and that also failed. What's the deal?