Comment 9 for bug 2019158

Hi. I think this is happening because firefox leaves processes hanging in its cgroup scope which means snapd can't detect it has closed and refresh it (see: https://forum.snapcraft.io/t/close-the-app-to-avoid-disruptions-for-a-closed-app/34291/5?u=miguelpires). If this happens again, you can check if that's the case by running `systemctl status` and checking if there's still a cgroup scope for the snap.