To fix https://bugzilla.mozilla.org/show_bug.cgi?id=1934713 (Firefox snap AppArmor denial on /etc/fstab when using file chooser dialog) we added a mount-observe
plug to firefox, Add mount-observe plug for https://bugzilla.mozilla.org/1934713 by alexmurray · Pull Request #107 · canonical/firefox-snap · GitHub
We would like to see it autoconnected to silent those journal warnings for the firefox snap users