DOD access card certificates not recognized when trying to access web sites with a card reader while older version of firefox did.

In the past I have been able to access web sites that require certificates pulled from a common access card inserted into a card reader attached to my Mac. Since I have updated to the newer version of Firefox, the sites that I am trying to gain entry to are not recognizing either the card, card reader or those certificates. If I use Safari or my work computer, the sites recognize my card and certificates and I am grated entry. I would use Safari but I like the format of Firefox for the specific tasks that require the access card. Just looking for a solution. Firefox does open other sites just fine. It's just the ones that require the card, reader and certificates.