Hy Giangavino.....

unfortunately I can not find more about Smart card login, but I think this documentation will help to you

https://militarycac.com/files/Tech_Note_Firefox_CAC_Authentication.pdf

Dear Dinushi Dhananjani, thank you for your suggestion. Unfortunately, my problem only occurs with the CNS Actalis, with which you could set the asepkcs.dll library to configure the security device. Until version 74 it worked correctly, but since I installed version 75, it no accepts the asepkcs.dll library and CNS Actalis cannot be used. I hope it can be restored with the next version of Mozilla Firefox.

Thanks again Giangavino

also see https://bugzilla.mozilla.org/show_bug.cgi?id=1629002

Thanks, Philip! I think I will have to wait for new drivers from the CNS provider...

out of interest, can the new experimental feature described at https://blog.mozilla.org/security/2020/04/14/expanding-client-certificates-in-firefox-75/ help in this situation?

Hi Philipp, I set the "security.osclientcerts.autoload" parameter to true, but the problem persists. Thank you very much for your interest