Comment 11 for bug 1843392

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:93.0) Gecko/20100101 Firefox/93.0

Steps to reproduce:

This is a snap-specific issue. It was previously reported in various places:
  - https://forum.snapcraft.io/t/cant-load-security-device-in-firefox-snap/12471
  - https://forum.snapcraft.io/t/confined-browser-snaps-cant-use-system-libraries-pkcs11-and-native-host-messaging-what-do-we-do/11828
  - https://forum.snapcraft.io/t/access-external-lib-to-use-usb-token-in-firefox/13959
  - https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1843392

Snapd's strict confinement makes it impossible for the firefox snap to load PKCS#11 security devices from `about:preferences#privacy` ("Security Devices" button in the "Security" section), because it denies access to `/usr/lib/pkcs11` and to `/var/run/pcscd/pcscd.comm`.