Set a custom Certificate Database on chromeos

Help
1

Hello, I am trying to follow the okular manual on how to add a digital certificate.

I followed the steps from the docs ( PDF Digital Signature Certificates)

However, I still can’t perform a digital signature after pointing to the same folder on my system:

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my digital certificate is already installed on Firefox.

Am I doing something wrong?

2

I also tried to do the same in Okular for Windows and also without success while pointing to Firefox certificates database. But when I pointed Thunderbird certificates database, the certificate appeared in Okular and I can use it to sign documents. So, try to use Thunderbird certificates database instead of Firefox.