Crash report: https://crash-stats.mozilla.org/report/index/4d4158e8-07bb-45e6-ad34-3dbd30210116

Reason: EXCEPTION_ACCESS_VIOLATION_WRITE

Top 10 frames of crashing thread:

0 xul.dll linear_convert_yuv gfx/wr/swgl/src/composite.h:853
1 xul.dll CompositeYUV gfx/wr/swgl/src/composite.h:915
2 xul.dll webrender_bindings::swgl_bindings::SwCompositeThread::process_job gfx/webrender_bindings/src/swgl_bindings.rs:749
3 xul.dll std::sys_common::backtrace::__rust_begin_short_backtrace<closure-0, tuple<>> ../e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:131
4 xul.dll core::ops::function::FnOnce::call_once<closure-0, tuple<>> ../e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/ops/function.rs:227
5 xul.dll std::sys::windows::thread::{{impl}}::new::thread_start ../e1884a8e3c3e813aada8254edfa120e85bf5ffca//library/std/src/sys/windows/thread.rs:56
6 kernel32.dll BaseThreadInitThunk 
7 mozglue.dll patched_BaseThreadInitThunk mozglue/dllservices/WindowsDllBlocklist.cpp:591
8 ntdll.dll RtlUserThreadStart 
9 kernelbase.dll OpenCustomLocaleKey 

This seems to have started with buildid 20210115125655.