It first appeared in 17.0a1/20120726 and is currently #1 top crasher in today's build. The regression range is: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=ef20925bc2a5&tochange=20db7c6d82cc It's likely a regression from bug 770096. Signature nsTArray_base<nsTArrayDefaultAllocator>::SwapArrayElements<nsTArrayDefaultAllocator>(nsTArray_base<nsTArrayDefaultAllocator>&, unsigned int, unsigned int) | nsTArray<mozilla::FrameLayerBuilder::ClippedDisplayItem, nsTArrayDefaultAllocator>::SwapElement... More Reports Search UUID e56acb32-1c7b-4298-94a4-ae2672120726 Date Processed 2012-07-26 20:22:54 Uptime 3279 Last Crash 21.7 hours before submission Install Age 54.6 minutes since version was first installed. Install Time 2012-07-26 19:27:40 Product Firefox Version 17.0a1 Build ID 20120726052803 Release Channel nightly OS Windows NT OS Version 6.1.7601 Service Pack 1 Build Architecture x86 Build Architecture Info GenuineIntel family 6 model 15 stepping 13 Crash Reason EXCEPTION_ACCESS_VIOLATION_READ Crash Address 0x8 App Notes AdapterVendorID: 0x10de, AdapterDeviceID: 0x0427, AdapterSubsysID: 02731028, AdapterDriverVersion: 7.15.11.7597 D3D10 Layers? D3D10 Layers- D3D9 Layers? D3D9 Layers- Processor Notes SignatureTool: signature truncated due to length EMCheckCompatibility True Adapter Vendor ID 0x10de Adapter Device ID 0x0427 Total Virtual Memory 2147352576 Available Virtual Memory 1645158400 System Memory Use Percentage 49 Available Page File 4738867200 Available Physical Memory 1637126144 Frame Module Signature Source 0 xul.dll nsTArray_base<nsTArrayDefaultAllocator>::SwapArrayElements<nsTArrayDefaultAlloca obj-firefox/dist/include/nsTArray-inl.h:314 1 xul.dll nsTArray<mozilla::FrameLayerBuilder::ClippedDisplayItem,nsTArrayDefaultAllocator obj-firefox/dist/include/nsTArray.h:994 2 xul.dll mozilla::FrameLayerBuilder::DrawThebesLayer layout/base/FrameLayerBuilder.cpp:2625 3 xul.dll mozilla::layers::BasicShadowableThebesLayer::PaintBuffer gfx/layers/basic/BasicThebesLayer.cpp:391 4 xul.dll mozilla::layers::BasicThebesLayer::PaintThebes gfx/layers/basic/BasicThebesLayer.cpp:190 5 xul.dll mozilla::layers::BasicShadowableThebesLayer::PaintThebes gfx/layers/basic/BasicThebesLayer.cpp:288 6 xul.dll mozilla::layers::BasicLayerManager::PaintLayer gfx/layers/basic/BasicLayerManager.cpp:808 7 xul.dll mozilla::layers::BasicLayerManager::PaintLayer gfx/layers/basic/BasicLayerManager.cpp:823 8 xul.dll mozilla::layers::BasicLayerManager::PaintLayer gfx/layers/basic/BasicLayerManager.cpp:823 9 xul.dll mozilla::layers::BasicLayerManager::PaintLayer gfx/layers/basic/BasicLayerManager.cpp:823 10 xul.dll mozilla::layers::BasicLayerManager::EndTransactionInternal gfx/layers/basic/BasicLayerManager.cpp:449 11 xul.dll mozilla::FrameLayerBuilder::WillEndTransaction layout/base/FrameLayerBuilder.cpp:738 12 xul.dll mozilla::layers::BasicShadowLayerManager::EndTransaction gfx/layers/basic/BasicLayerManager.cpp:1022 13 xul.dll xul.dll@0xdae3f 14 xul.dll nsDisplayList::PaintForFrame layout/base/nsDisplayList.cpp:655 More reports at: https://crash-stats.mozilla.com/report/list?signature=nsTArray_base%3CnsTArrayDefaultAllocator%3E%3A%3ASwapArrayElements%3CnsTArrayDefaultAllocator%3E%28nsTArray_base%3CnsTArrayDefaultAllocator%3E%26%2C+unsigned+int%2C+unsigned+int%29+|+nsTArray%3Cmozilla%3A%3AFrameLayerBuilder%3A%3AClippedDisplayItem%2C+nsTArrayDefaultAllocator%3E%3A%3ASwapElement...

That link doesn't appear to work, it's showing no reports. STR would be really helpful here.

(In reply to Matt Woodrow (:mattwoodrow) from comment #1) > That link doesn't appear to work, it's showing no reports. Add ... at the end of the clickable link.

Crashes are gone in 17.0a1/20120728. The working range is: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=8b96a33ecbd2&tochange=2abd21593e57 It might be fixed by bug 777924.