Note that the `WinWindowOcclusionTracker` one seems to be responsible for quite some thunderbird shutdown hangs.
Bug 1798630 Comment 1 Edit History
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Note that the `WinWindowOcclusionTracker` one seems to be responsible for quite some thunderbird shutdown hangs. Just using `nsThread::Shutdown` might not help (though spinning the MT event loop while waiting is an improvement), but at least the hang will happen when expected.