I had a similar hang today. I switched to a phabricator that that I had, and the content process was unresponsive for a long time. I captured a profile and it was spending the whole time in `__bsdthread_ctl` that's inside `HangMonitorChild::RecvSetMainThreadQoSPriority`: https://share.firefox.dev/4azCaTY
Bug 1864641 Comment 10 Edit History
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I had a similar hang today. I switched to a phabricator tab that I had, and the content process was unresponsive for a long time. I captured a profile and it was spending the whole time in `__bsdthread_ctl` that's inside `HangMonitorChild::RecvSetMainThreadQoSPriority`: https://share.firefox.dev/4azCaTY