Comment 25 for bug 1925392

I dropped the following into /etc/apparmor.d/local/usr.bin.firefox and after running `sudo apparmor_parser -r < /etc/apparmor.d/usr.bin.firefox` and restarting Firefox (so that it can bind to the name) it seems to work.

  dbus send
       bus=session
       path=/org/freedesktop/DBus
       interface=org.freedesktop.DBus
       member=RequestName
       peer=(name=org.freedesktop.DBus),

  dbus bind
       bus=session
       name=org.mozilla.firefox.*,

  dbus (send, receive)
       bus=session
       path=/org/mozilla/firefox/Remote
       interface=org.mozilla.firefox
       member=OpenURL
       peer=(label=firefox),