Getting "The PKCS #12 operation failed for unknown reasons" error when trying to add a certificate
I'm doing some testing regarding mutual SSL authentication, and when I try to add the .pfx certificate that I generated, I get "The PKCS #12 operation failed for unknown reasons" as the error, and the certificate doesn't get added.
I tried this on another browser, and there was no problem regarding the usage of the certificate, so I can assure the certificate, its data, or the generation process was wrong.
I'm currently using Firefox 80.0.1 64-bit for Ubuntu.
Any help would be greatly appreciated.