This bug was filed from the Socorro interface and is report bp-747579cd-c889-47c4-b790-9bb752150524. ============================================================= IIRC this is a content crash on all tabs when you shutdown the computer without closing Nightly first. Crashing Thread Frame Module Signature Source 0 xul.dll RuleCascadeData::~RuleCascadeData() layout/style/nsCSSRuleProcessor.cpp 1 xul.dll RuleCascadeData::`scalar deleting destructor'(unsigned int) 2 xul.dll nsCSSRuleProcessor::ClearRuleCascades() layout/style/nsCSSRuleProcessor.cpp 3 xul.dll nsCSSRuleProcessor::~nsCSSRuleProcessor() layout/style/nsCSSRuleProcessor.cpp 4 xul.dll nsCSSRuleProcessor::`scalar deleting destructor'(unsigned int) 5 xul.dll nsCSSRuleProcessor::DeleteCycleCollectable() layout/style/nsCSSRuleProcessor.cpp 6 xul.dll SnowWhiteKiller::~SnowWhiteKiller() xpcom/base/nsCycleCollector.cpp 7 xul.dll nsCycleCollector::FreeSnowWhite(bool) xpcom/base/nsCycleCollector.cpp 8 xul.dll AsyncFreeSnowWhite::Run() js/xpconnect/src/XPCJSRuntime.cpp 9 xul.dll nsThread::ProcessNextEvent(bool, bool*) xpcom/threads/nsThread.cpp 10 xul.dll mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) ipc/glue/MessagePump.cpp 11 xul.dll mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) ipc/glue/MessagePump.cpp 12 xul.dll MessageLoop::RunHandler() ipc/chromium/src/base/message_loop.cc 13 xul.dll MessageLoop::Run() ipc/chromium/src/base/message_loop.cc 14 xul.dll nsBaseAppShell::Run() widget/nsBaseAppShell.cpp 15 xul.dll nsAppShell::Run() widget/windows/nsAppShell.cpp 16 xul.dll XRE_RunAppShell toolkit/xre/nsEmbedFunctions.cpp 17 xul.dll mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) ipc/glue/MessagePump.cpp 18 xul.dll MessageLoop::RunHandler() ipc/chromium/src/base/message_loop.cc 19 xul.dll MessageLoop::Run() ipc/chromium/src/base/message_loop.cc 20 xul.dll XRE_InitChildProcess toolkit/xre/nsEmbedFunctions.cpp 21 plugin-container.exe content_process_main(int, char** const) ipc/contentproc/plugin-container.cpp 22 plugin-container.exe wmain toolkit/xre/nsWindowsWMain.cpp 23 plugin-container.exe __tmainCRTStartup f:/dd/vctools/crt/crtw32/startup/crt0.c:255 24 kernel32.dll BaseThreadInitThunk 25 ntdll.dll RtlUserThreadStart

Can you tell us exactly how you shutdown the computer so we can try to reproduce it? Can you reproduce it with a clean profile?

¡Hola Mats! All I do is this without closing Nightly first: - Click "Start" bubble - Click "Shut down"

Alex, can you reproduce this with E10S disabled?

I haven't seen this crash signature in a while on Nightly, let's hope it stays this way...

Updating crash signature to reflect changes to signature generation made in bug 1269817 (although reports older than a week will not be reprocessed), and adding dependency to ShutDownKill metabug. (These probably shouldn't all be separate bugs, but I'm not going to fix that up in a mass-change.)