Change FF instructions to use OpenSC

Yubikey Notes.md

@@ -213,11 +213,11 @@ sudo sc_auth pair -u duane.e.waddle -h 6457632695DEB718A2D13BC1E6F038F82CB7AB85
 ### For Firefox
 
 1. In firefox, go to about:config, search for "security.enterprise" and set `security.enterprise_roots.enabled` to `True`
-1. Download the pkcs modules https://github.com/kenh/keychain-pkcs11/releases and install.
-1. In firefox, go to settings->Preferences, then `Privacy & Security`, then find Certificates and click the button marked 'Security Devices'.
+1. `brew install opensc`
+1. In Firefox, go to Settings->Preferences, then `Privacy & Security`, then find Certificates and click the button marked 'Security Devices'.
 1. Click 'Load'
-1. Enter `PIV` in the module field name.
-1. Enter `/usr/local/lib/keychain-pkcs11.dylib` in the Load box.
+1. Enter `OpenSC PKCS#11` in the module field name.
+1. Enter `/usr/local/lib/opensc-pkcs11.so` in the Load box.
 1. Click "Okay".
 
 SHould be good to go!