This bug was filed from the Socorro interface and is report bp-8bb75100-c7d0-49a4-b2f2-6291d2140325. ============================================================= All of these reports are happening in Windows 7. There are reports in 27.0.1, 28.0, but most of them are in Firefox 29b, starting in 3/18 (beta1). Comments indicate this happens randomly and frequently, but I don't see a lot of dupes. Most of the URLs point to https://www.facebook.com/... 0 d3d10_1core.dll CDevice::ID3D10Device1_CopySubresourceRegion_(ID3D10Device1 *,ID3D10Resource *,unsigned int,unsigned int,unsigned int,unsigned int,ID3D10Resource *,unsigned int,D3D10_BOX const *) 1 d3d10_1core.dll NMultithread::CDevice::CopySubresourceRegion(ID3D10Resource *,unsigned int,unsigned int,unsigned int,unsigned int,ID3D10Resource *,unsigned int,D3D10_BOX const *) 2 xul.dll mozilla::layers::ThebesLayerD3D10::CopyRegion(ID3D10Texture2D *,nsIntPoint const &,ID3D10Texture2D *,nsIntPoint const &,nsIntRegion const &,nsIntRegion *) gfx/layers/d3d10/ThebesLayerD3D10.cpp 3 xul.dll mozilla::layers::ThebesLayerD3D10::Validate(mozilla::layers::ReadbackProcessor *) gfx/layers/d3d10/ThebesLayerD3D10.cpp 4 xul.dll mozilla::layers::ContainerLayerD3D10::Validate() gfx/layers/d3d10/ContainerLayerD3D10.cpp 5 xul.dll mozilla::layers::ContainerLayerD3D10::Validate() gfx/layers/d3d10/ContainerLayerD3D10.cpp 6 xul.dll mozilla::layers::LayerManagerD3D10::Render(mozilla::layers::LayerManager::EndTransactionFlags) gfx/layers/d3d10/LayerManagerD3D10.cpp 7 xul.dll mozilla::layers::LayerManagerD3D10::EndTransaction(void (*)(mozilla::layers::ThebesLayer *,gfxContext *,nsIntRegion const &,mozilla::layers::DrawRegionClip,nsIntRegion const &,void *),void *,mozilla::layers::LayerManager::EndTransactionFlags) gfx/layers/d3d10/LayerManagerD3D10.cpp 8 xul.dll nsDisplayList::PaintForFrame(nsDisplayListBuilder *,nsRenderingContext *,nsIFrame *,unsigned int) layout/base/nsDisplayList.cpp 9 xul.dll nsLayoutUtils::PaintFrame(nsRenderingContext *,nsIFrame *,nsRegion const &,unsigned int,unsigned int) layout/base/nsLayoutUtils.cpp 10 xul.dll PresShell::Paint(nsView *,nsRegion const &,unsigned int) layout/base/nsPresShell.cpp 11 xul.dll nsViewManager::ProcessPendingUpdatesPaint(nsIWidget *) view/src/nsViewManager.cpp 12 xul.dll nsViewManager::ProcessPendingUpdatesForView(nsView *,bool) view/src/nsViewManager.cpp 13 xul.dll nsRefreshDriver::Tick(__int64,mozilla::TimeStamp) layout/base/nsRefreshDriver.cpp 14 xul.dll mozilla::RefreshDriverTimer::Tick() layout/base/nsRefreshDriver.cpp 15 xul.dll nsTimerImpl::Fire() xpcom/threads/nsTimerImpl.cpp 16 xul.dll nsTimerEvent::Run() xpcom/threads/nsTimerImpl.cpp 17 xul.dll nsThread::ProcessNextEvent(bool,bool *) xpcom/threads/nsThread.cpp 18 nss3.dll PR_Unlock nsprpub/pr/src/threads/combined/prulock.c 19 xul.dll mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate *) ipc/glue/MessagePump.cpp 20 xul.dll _SEH_epilog4 21 xul.dll MessageLoop::Run() ipc/chromium/src/base/message_loop.cc 22 xul.dll nsBaseAppShell::Run() widget/xpwidgets/nsBaseAppShell.cpp 23 xul.dll nsAppShell::Run() widget/windows/nsAppShell.cpp 24 nss3.dll nss3.dll@0x7960 25 xul.dll XREMain::XRE_main(int,char * * const,nsXREAppData const *) toolkit/xre/nsAppRunner.cpp 26 xul.dll XRE_main toolkit/xre/nsAppRunner.cpp 27 firefox.exe do_main browser/app/nsBrowserApp.cpp 28 firefox.exe NS_internal_main(int,char * *) browser/app/nsBrowserApp.cpp 29 firefox.exe wmain toolkit/xre/nsWindowsWMain.cpp 30 firefox.exe __tmainCRTStartup f:/dd/vctools/crt_bld/self_x86/crt/src/crtexe.c 31 kernel32.dll BaseThreadInitThunk 32 ntdll.dll __RtlUserThreadStart 33 ntdll.dll _RtlUserThreadStart

This signature is not showing up for anything since Firefox 33.