I recently also found out that those dbus "receive" rules were missing:
dbus receive bus=session path=/org/gtk/Private/RemoteVolumeMonitor interface=org.gtk.Private.RemoteVolumeMonitor member={VolumeAdded,VolumeRemoved}, -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1533232 Title: missing many apparmor rules on Xenial To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1533232/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs