Smart Card Logon for Firefox Browser PKI ISSUE RESOLVED

1. Navigate to about:config in Firefox, search for security.osclientcerts.autoload, and set it to true 1690278 - Duplicate certificate selection and PIN requested twice when security.osclientcerts.autoload is 'true'. This enables Firefox's built-in module for accessing certificates stored in the macOS keychain.

Check Security Devices

1. Go to about:preferences, search for "Security Devices", and verify that PKCS#11 modules are properly loaded 1681442 - PIV Card authentication not working on Firefox. You should see the "OS Client Cert Module" listed when osclientcerts.autoload is enabled.

Configure OpenSC (Alternative Approach)

1. If the built-in module doesn't work, you can install OpenSC and manually load the PKCS#11 module in Firefox's Security Devices by adding the OpenSC PKCS #11 driver IDManagementGitHub.

1. Ensure that your PIV credential issuer's certification authority (CA) certificate is imported and trusted in Firefox's certificate store IDManagementGitHub