We are using Firefox as one of our corporate browsers. We are currently rolling out two factor authentication for mission critical web applications using managed PKI infrastructure. We have enrolled our employees for non-exportable client authentication certificates which are being stored in their internal Windows Certificate Storage. We can now easily authenticate towards our corporate websites using Internet Explorer or Google Chrome. However, we did not manage to get Firefox to use the client authentication certificate from the Windows Certificate Storage. I understand that Firefox maintains its own certificate storage, but is there a way to configure Firefox to use the client authentication certificates stored in Windows Certificate Storage? Thank you very much for any feedback including information that it is not possible by design.