Sometimes, the back-end server version dictates exactly which client version is supported to prevent data corruption. Conclusion
Update your hardware card reader drivers to their native x64 versions. Ensure the Smart Card service ( SCardSvr ) is running in the Windows Services console ( services.msc ). classic client 6.3.12 for 64 bits
Drivers, API libraries, and cryptographic service providers (CSPs). Security Devices >
[64-Bit OS Application] ──(Direct 64-Bit Path)──> [Classic Client 64-Bit Middleware] ──> [Hardware Smart Card] classic client 6.3.12 for 64 bits
To manually load the module, navigate to Firefox's security devices (from Tools > Options > Advanced > Encryption > Security Devices > Load ) and browse to the correct gclib.dll .