It happens around 365 seconds after the startup except once when it occurred at 8 seconds. Signature Microsoft::WRL::Details::WeakReference::DecrementStrongReference() More Reports Search UUID 1b95bcd8-5b45-4b6c-b35a-87ae82130307 Date Processed 2013-03-07 11:31:49 Uptime 365 Install Age 6.1 minutes since version was first installed. Install Time 2013-02-28 02:12:41 Product MetroFirefox Version 22.0a1 Build ID 20130227030925 Release Channel nightly OS Windows NT OS Version 6.2.9200 Build Architecture x86 Build Architecture Info GenuineIntel family 6 model 37 stepping 5 Crash Reason EXCEPTION_ACCESS_VIOLATION_WRITE Crash Address 0xc User Comments Processor Notes sp-processor02.phx1.mozilla.com_31979:2008; WARNING: JSON file missing Add-ons EMCheckCompatibility False Total Virtual Memory 4294836224 Available Virtual Memory 4166967296 System Memory Use Percentage 65 Available Page File 3542822912 Available Physical Memory 1453854720 Frame Module Signature Source 0 xul.dll Microsoft::WRL::Details::WeakReference::DecrementStrongReference implements.h:1850 1 xul.dll Microsoft::WRL::Details::RuntimeClass<Microsoft::WRL::Details::InterfaceList<ABI implements.h:1666 2 xul.dll Microsoft::WRL::ComPtr<mozilla::widget::winrt::MetroApp>::InternalRelease client.h:177 3 xul.dll XRE_mainMetro toolkit/xre/nsAppRunner.cpp:4130 4 xul.dll XRE_main toolkit/xre/nsAppRunner.cpp:4175 5 firefox.exe do_main browser/app/nsBrowserApp.cpp:324 6 firefox.exe wmain toolkit/xre/nsWindowsWMain.cpp:105 7 firefox.exe __tmainCRTStartup crtexe.c:552 8 kernel32.dll BaseThreadInitThunk 9 ntdll.dll __RtlUserThreadStart 10 ntdll.dll _RtlUserThreadStart More reports at: https://crash-stats.mozilla.com/report/list?signature=Microsoft%3A%3AWRL%3A%3ADetails%3A%3AWeakReference%3A%3ADecrementStrongReference%28%29

No URLs found for signature Microsoft::WRL::Details::WeakReference::DecrementStrongReference()

This is likely bug 833016.

The latest crashes happened in 22.0a1/20130327 so it's fixed by the patch of bug 833016.