Build: Mozilla/5.0 (Windows NT 6.1; rv:2.0b8pre) Gecko/20101111 Firefox/4.0b8pre It is a new crash signature. Crashes first appeared with this build. It is #3 mega top crasher in this build: 350 crashes/buildday. It is probably a dupe of bug 611593. Signature mozilla::plugins::PluginInstanceChild::AnswerNPP_Destroy(short*) UUID 91ed3687-0757-46b2-8157-642432101112 Process Type plugin Version: Filename: NPSWF32.dll Time 2010-11-12 01:23:00.602659 Uptime 123 Install Age 49096 seconds (13.6 hours) since version was first installed. Product Firefox Version 4.0b8pre Build ID 20101111042449 Branch 2.0 OS Windows NT OS Version 5.1.2600 Service Pack 3 CPU x86 CPU Info GenuineIntel family 6 model 23 stepping 6 Crash Reason EXCEPTION_ACCESS_VIOLATION_READ Crash Address 0xa App Notes AdapterVendorID: 10de, AdapterDeviceID: 0622 Frame Module Signature [Expand] Source 0 xul.dll mozilla::plugins::PluginInstanceChild::AnswerNPP_Destroy dom/plugins/PluginInstanceChild.cpp:2961 1 xul.dll mozilla::plugins::PPluginInstanceChild::OnCallReceived obj-firefox/ipc/ipdl/PPluginInstanceChild.cpp:1681 2 xul.dll mozilla::plugins::PPluginModuleChild::OnCallReceived obj-firefox/ipc/ipdl/PPluginModuleChild.cpp:574 3 xul.dll mozilla::ipc::RPCChannel::DispatchIncall ipc/glue/RPCChannel.cpp:517 4 xul.dll mozilla::ipc::RPCChannel::Incall ipc/glue/RPCChannel.cpp:503 5 xul.dll mozilla::ipc::RPCChannel::OnMaybeDequeueOne ipc/glue/RPCChannel.cpp:434 6 xul.dll MessageLoop::RunTask ipc/chromium/src/base/message_loop.cc:343 7 xul.dll MessageLoop::DeferOrRunPendingTask ipc/chromium/src/base/message_loop.cc:351 8 xul.dll MessageLoop::DoWork ipc/chromium/src/base/message_loop.cc:451 9 xul.dll base::MessagePumpForUI::DoRunLoop ipc/chromium/src/base/message_pump_win.cc:213 10 xul.dll base::MessagePumpWin::RunWithDispatcher ipc/chromium/src/base/message_pump_win.cc:52 11 xul.dll base::MessagePumpWin::Run ipc/chromium/src/base/message_pump_win.h:78 12 xul.dll MessageLoop::RunInternal ipc/chromium/src/base/message_loop.cc:219 13 xul.dll MessageLoop::RunHandler 14 xul.dll MessageLoop::Run ipc/chromium/src/base/message_loop.cc:176 15 xul.dll XRE_InitChildProcess toolkit/xre/nsEmbedFunctions.cpp:506 16 plugin-container.exe wmain toolkit/xre/nsWindowsWMain.cpp:125 17 plugin-container.exe __tmainCRTStartup obj-firefox/memory/jemalloc/crtsrc/crtexe.c:591 18 kernel32.dll BaseProcessStart The regression range is: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=df1d1ff6b489&tochange=0f17e5f1eb01 More reports at: http://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=exact&query=&range_value=4&range_unit=weeks&hang_type=any&process_type=any&plugin_field=&plugin_query_type=&plugin_query=&do_query=1&admin=&signature=mozilla%3A%3Aplugins%3A%3APluginInstanceChild%3A%3AAnswerNPP_Destroy%28short*%29

Let's call it a dup for now.