ChatZilla requires that the cert you made be converted to a different format called pkcs12. You can use OpenSSL to do the conversion: openssl pkcs12 -export -out mynick.pfx -in mynick.pem Click Preferences, then Advanced Options, then Encryption. This will open the ChatZilla certificate manager. Under “View certificates” there should be an option to import mynick.pfx. … Continue reading Configuring Client SSL Certificates for ChatZilla