In the recent [ShutdownKill data](https://crash-stats.mozilla.org/signature/?product=Firefox&signature=IPCError-browser%20%7C%20ShutDownKill&date=%3E%3D2023-11-07T13%3A05%3A00.000Z&date=%3C2023-11-14T13%3A05%3A00.000Z&_columns=date&_columns=product&_columns=version&_columns=build_id&_columns=platform&_columns=reason&_columns=address&_columns=install_time&_columns=startup_crash&_sort=-build_id&_sort=-date&page=1) all MacvOS instances I clicked on were stuck inside [HangMonitorChild::RecvSetMainThreadQoSPriority](https://searchfox.org/mozilla-central/rev/d6576544301cacc0e393fbc919c53e4e6b0d46ec/dom/ipc/ProcessHangMonitor.cpp#674).
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In the recent [ShutdownKill data](https://crash-stats.mozilla.org/signature/?product=Firefox&signature=IPCError-browser%20%7C%20ShutDownKill&date=%3E%3D2023-11-07T13%3A05%3A00.000Z&date=%3C2023-11-14T13%3A05%3A00.000Z&_columns=date&_columns=product&_columns=version&_columns=build_id&_columns=platform&_columns=reason&_columns=address&_columns=install_time&_columns=startup_crash&_sort=-build_id&_sort=-date&page=1) all MacOS instances I clicked on were stuck inside [HangMonitorChild::RecvSetMainThreadQoSPriority](https://searchfox.org/mozilla-central/rev/d6576544301cacc0e393fbc919c53e4e6b0d46ec/dom/ipc/ProcessHangMonitor.cpp#674).