Crash report: https://crash-stats.mozilla.org/report/index/5167dcef-a821-41dc-bd71-1bb3f0210909

Reason: STATUS_HEAP_CORRUPTION

Top 10 frames of crashing thread:

0 ntdll.dll RtlReportCriticalFailure 
1 ntdll.dll RtlpReportHeapFailure 
2 ntdll.dll RtlpHeapHandleError 
3 ntdll.dll RtlpLogHeapFailure 
4 ntdll.dll zzz_AsmCodeRange_End 
5 msvcrt.dll free 
6 d3d11.dll void operator delete 
7 dxgi.dll static void CDXGISwapChainBase<struct IDXGISwapChain>::DestroyOwnedBuffer 
8 dxgi.dll void CDXGISwapChainBase<struct IDXGISwapChain>::DestroyBackBuffers 
9 dxgi.dll long CDXGISwapChainBase<struct IDXGISwapChain>::ScenarioResizeBuffers 

also RtlpReportHeapFailure | zzz_AsmCodeRange_End | RtlpAllocateHeap | free | delete
bp-c70d066b-0a99-4840-981e-e1c3b0210910

ANd perhaps others https://crash-stats.mozilla.org/search/?signature=~RtlpReportHeapFailure&product=Thunderbird&date=%3E%3D2021-08-29T08%3A20%3A00.000Z&date=%3C2021-09-12T08%3A20%3A00.000Z&_facets=signature&_facets=platform&_facets=platform_pretty_version&_sort=-date&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-signature

Related to Bug 1678808 - many crashes on Windows 7 with mostly AMD processors in code related to shaders ?? Which got fixed by backout of bug 1677818

no recent crashes