Firefox allows sysadmins to define enterprise policies to customize the browsing experience. These policies are stored in
/etc/firefox/policies/ on the host filesystem, which is typically not readable by a strictly confined snap.
A plug was recently added to the system-files interfaces to allow read access to that path:
plugs: etc-firefox-policies: interface: system-files read: [/etc/firefox/policies]
This is a request for the corresponding store declaration to auto-connect the interface.
Thanks for considering it!