This bug is for crash report bp-826be251-5c59-4438-b2df-228880200612.

Top 10 frames of crashing thread:

0 mozglue.dll static Allocator<MozJemallocBase>::free memory/build/malloc_decls.h:54
1 mozglue.dll replace_free memory/replace/phc/PHC.cpp:1312
2 xul.dll std::vector< vs2017_15.8.4/VC/include/vector:1916
3 xul.dll mozilla::StaticAutoPtr<std::unordered_map<mozilla::ipc::IProtocol*, mozilla::webgl::PcqActor*, std::hash<mozilla::ipc::IProtocol*>, std::equal_to<mozilla::ipc::IProtocol*>, std::allocator<std::pair<mozilla::ipc::IProtocol*const, mozilla::webgl::PcqActor*> > > >::Assign xpcom/base/StaticPtr.h:93
4 xul.dll mozilla::webgl::PcqActor::~PcqActor dom/canvas/ProducerConsumerQueue.h:79
5 xul.dll mozilla::dom::WebGLParent::~WebGLParent dom/canvas/WebGLParent.cpp:46
6 xul.dll mozilla::dom::WebGLParent::~WebGLParent dom/canvas/WebGLParent.cpp:46
7 xul.dll mozilla::dom::WebGLChild::Release dom/canvas/WebGLChild.h:27
8 xul.dll mozilla::ipc::ActorLifecycleProxy::~ActorLifecycleProxy ipc/glue/ProtocolUtils.cpp:247
9 xul.dll mozilla::layers::PCompositorBridgeChild::ClearSubtree ipc/ipdl/PCompositorBridgeParent.cpp:2740

The severity field is not set for this bug.
:jgilbert, could you have a look please?

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