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HOWTO
CERTIFICATES
ADD YOUR OWN CA TO FIREFOX

Published: 20220203

Tested on:
- Firefox Browser Version: 96.0 (64-bit)
- OS: Ubuntu 20.04.3 amd64

Open the Certficate Manager

• Press the three-lines-menu (top right)
• Press "Settings"
• In the menu to the left, press "Privacy & Security"
• Scroll down to the bottom, to the section named "Certificates" and press "View Certificates..."

(You are now in the "Certificate Manager")

• Press "Import..."
• Find your "CA.crt" file, mark it and press "Open"
• Check the box "Trust this CA to identify websites."
• Press "View" and
  • MAKE SURE THIS FILE IS REALLY REALLY REALLY VERIFIED BEFORE YOU ADD IT
• Press "OK"
• Press "OK" again to leave the "Certificate Manager"

Your new CA certificate is now installed.

If for some reason your newly imported certificate doesn't work, you may have forgotten to check "Trust this CA to identify websites." You can fix this with by opening the Certificate Manager and press "Edit Trust...", or you can delete the certificate and add it again.

-

[1]:

You can verify the Thumbprint with openssl and one of these commands:

openssl x509 -noout -fingerprint -md5    -inform pem -in myCA.crt  
openssl x509 -noout -fingerprint -sha1   -inform pem -in myCA.crt  
openssl x509 -noout -fingerprint -sha256 -inform pem -in myCA.crt