PKI Tutorials - Herong's Tutorial Examples - v2.20, by Dr. Herong Yang
Failing to Import Root CA Certificates to Mozilla Firefox
This section provides a tutorial example on how to import a root CA certificate into Mozilla Firefox. The import process failed with an error.
If I don't want to add a security exception to trust the Yahoo site when Firefox gives me the "Your Connection is not secure" error, I need to fix the error.
Since I know the root cause of this error is missing the root CA certificate, I can try to fix by importing the root CA certificate "DigiCert High Assurance EV Root CA" back into Mozilla Firefox from the certificate file I created earlier.
1. Repeat steps listed in the previous tutorial until you see the
2. Click the "Authorities" tab, since I want to import a CA (Certificate Authority) certificate.
3. Click the "Import" button. The "Select File containing CA certificate(s) to import" dialog box shows up.
4. Find and select \temp\DigitCer_Root_CA_pem.crt, which contains the "DigiCert High Assurance EV Root CA" certificate I created earlier.
7. Click the "Open" button to let Firefox import the certificate. Surprisingly, I got an error message box saying that "This certificate already installed as a certificate authority."
Why I am getting this error? I remember I deleted "DigiCert High Assurance EV Root CA" certificate from Firefox. Read the next section to find out the answer.
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