Hello,

Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that turns off some settings, disables most add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• In Firefox 29.0 and above, click the menu button , click Help and select Restart with Add-ons Disabled.
• In previous Firefox versions, click on the Firefox button at the top left of the Firefox window and click on Help (or click on Help in the Menu bar, if you don't have a Firefox button) then click on Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

Hi restart with safe mode close the fire fox still crash what to do now?

Yes, if you could submit some crash reports, that might be helpful in tracking down the problem.

Assuming Firefox saved the data on your past crashes, you should be able to access it using the about:crashes page as described in the last section of this support article: "Firefox Crashes".

If you find crash IDs that start with bp- then you can copy and paste those into a reply here. If they do not start with bp- please click them, and then when you get onto the crash-stats server, copy and paste the URL into a reply here.

https://crash-stats.mozilla.com/report/index/eef8d508-049f-4aa0-b0d1-6426b2140905

Firefox 32.0 Crash Report [@ mozilla::ReentrantMonitor::Enter() ] Search Mozilla Support for Help ID: eef8d508-049f-4aa0-b0d1-6426b2140905 Signature: mozilla::ReentrantMonitor::Enter()

   Details
   Metadata
   Modules
   Raw Dump
   Extensions
   Correlations

Signature mozilla::ReentrantMonitor::Enter() More Reports Search UUID eef8d508-049f-4aa0-b0d1-6426b2140905 Date Processed 2014-09-05 23:08:52.959706 Uptime 820 Last Crash 2726 seconds before submission Install Age 246579 since version was first installed. Install Time 2014-09-03 02:38:50 Product Firefox Version 32.0 Build ID 20140825202822 Release Channel release OS Windows NT OS Version 6.1.7601 Service Pack 1 Build Architecture x86 Build Architecture Info GenuineIntel family 6 model 23 stepping 7 | 4 Crash Reason EXCEPTION_ACCESS_VIOLATION_READ Crash Address 0x8 User Comments App Notes

AdapterVendorID: 0x10de, AdapterDeviceID: 0x1040, AdapterSubsysID: 00000000, AdapterDriverVersion: 9.18.13.1106 D2D? D2D+ DWrite? DWrite+ D3D10 Layers? D3D10 Layers+

Processor Notes sp-processor04_phx1_mozilla_com.22151:2012; HybridCrashProcessor EMCheckCompatibility

True

Winsock LSP

XunLei Net Monitor TCP/IP [MSAFD Tcpip [TCP/IP]] : 2 : 1 : C:\Program Files (x86)\Common Files\Thunder Network\NetMon\net_monitor2.0.2.9.dll

XunLei Net Monitor UDP/IP [MSAFD Tcpip [UDP/IP]] : 2 : 2 :  
XunLei Net Monitor RAW/IP [MSAFD Tcpip [RAW/IP]] : 2 : 3 : C:\Program Files (x86)\Common Files\Thunder Network\NetMon\net_monitor2.0.2.9.dll 
MSAFD Tcpip [TCP/IP] : 2 : 1 : %SystemRoot%\system32\mswsock.dll 
MSAFD Tcpip [UDP/IP] : 2 : 2 :  
MSAFD Tcpip [RAW/IP] : 2 : 3 : %SystemRoot%\system32\mswsock.dll 
MSAFD Tcpip [TCP/IPv6] : 2 : 1 :  
MSAFD Tcpip [UDP/IPv6] : 2 : 2 : %SystemRoot%\system32\mswsock.dll 
MSAFD Tcpip [RAW/IPv6] : 2 : 3 :  
RSVP TCPv6 Service Provider : 2 : 1 : %SystemRoot%\system32\mswsock.dll 
RSVP TCP Service Provider : 2 : 1 :  
RSVP UDPv6 Service Provider : 2 : 2 : %SystemRoot%\system32\mswsock.dll 
RSVP UDP Service Provider : 2 : 2 :  
XunLei Net Monitor : 2 : 3 : 

Adapter Vendor ID

0x10de

Adapter Device ID

0x1040

Total Virtual Memory

4294836224

Available Virtual Memory

3388465152

System Memory Use Percentage

48

Available Page File

5801725952

Available Physical Memory

2232229888

Bugzilla - Report this bug in Firefox Core Plugins Toolkit Related Bugs

   959007VERIFIED FIXED firefox crashes when starting html5 web player
   948049NEW --- crash in mozilla::ReentrantMonitor::Enter() via mozilla::MediaCacheStream::Close

Crashing Thread Frame Module Signature Source 0 xul.dll mozilla::ReentrantMonitor::Enter() obj-firefox/dist/include/mozilla/ReentrantMonitor.h 1 xul.dll mozilla::ReentrantMonitorAutoEnter::ReentrantMonitorAutoEnter(mozilla::ReentrantMonitor&) obj-firefox/dist/include/mozilla/ReentrantMonitor.h 2 xul.dll mozilla::MediaCacheStream::Close() content/media/MediaCache.cpp 3 xul.dll mozilla::ChannelMediaResource::Close() content/media/MediaResource.cpp 4 xul.dll mozilla::MediaDecoder::Shutdown() content/media/MediaDecoder.cpp 5 xul.dll mozilla::ShutdownMediaDecoder content/media/MediaShutdownManager.cpp 6 xul.dll nsTHashtable<nsPresArena::FreeList>::s_EnumStub(PLDHashTable*, PLDHashEntryHdr*, unsigned int, void*) obj-firefox/dist/include/nsTHashtable.h 7 xul.dll PL_DHashTableEnumerate(PLDHashTable*, PLDHashOperator (*)(PLDHashTable*, PLDHashEntryHdr*, unsigned int, void*), void*) xpcom/glue/pldhash.cpp 8 xul.dll nsTHashtable<nsRefPtrHashKey<mozilla::MediaDecoder> >::EnumerateEntries(PLDHashOperator (*)(nsRefPtrHashKey<mozilla::MediaDecoder>*, void*), void*) obj-firefox/dist/include/nsTHashtable.h 9 xul.dll mozilla::MediaShutdownManager::Shutdown() content/media/MediaShutdownManager.cpp 10 xul.dll mozilla::MediaShutdownManager::Observe(nsISupports*, char const*, wchar_t const*) content/media/MediaShutdownManager.cpp 11 xul.dll nsObserverList::NotifyObservers(nsISupports*, char const*, wchar_t const*) xpcom/ds/nsObserverList.cpp 12 xul.dll nsObserverService::NotifyObservers(nsISupports*, char const*, wchar_t const*) xpcom/ds/nsObserverService.cpp 13 xul.dll mozilla::ShutdownXPCOM(nsIServiceManager*) xpcom/build/nsXPComInit.cpp 14 xul.dll ScopedXPCOMStartup::~ScopedXPCOMStartup() toolkit/xre/nsAppRunner.cpp 15 xul.dll ScopedXPCOMStartup::`scalar deleting destructor'(unsigned int) 16 xul.dll XREMain::XRE_main(int, char** const, nsXREAppData const*) toolkit/xre/nsAppRunner.cpp 17 xul.dll XRE_main toolkit/xre/nsAppRunner.cpp 18 firefox.exe do_main browser/app/nsBrowserApp.cpp 19 firefox.exe NS_internal_main(int, char**) browser/app/nsBrowserApp.cpp 20 firefox.exe wmain toolkit/xre/nsWindowsWMain.cpp 21 firefox.exe __tmainCRTStartup f:/dd/vctools/crt_bld/self_x86/crt/src/crtexe.c:552 22 kernel32.dll BaseThreadInitThunk 23 ntdll.dll __RtlUserThreadStart 24 ntdll.dll _RtlUserThreadStart </p>

Show/hide other threads

hope this will help

Thanks, the link is the most helpful part because it shows whether there are related bugs on file, and comments from other users with the same issue.

It seems related to audio or video playing at the time of shutdown. Do you remember any tabs with running audio or video at that time? If so, could you try stopping it before shutting down the next time to see whether that makes any difference?

did not play anything I just open fire fox and check my email and shut down, and it crash like that let me give you the latest report

https://crash-stats.mozilla.com/report/index/6a987784-94cc-48e0-aa26-02d512140906

Firefox 32.0 Crash Report [@ mozilla::ReentrantMonitor::Enter() ] Search Mozilla Support for Help ID: 6a987784-94cc-48e0-aa26-02d512140906 Signature: mozilla::ReentrantMonitor::Enter()

   Details
   Metadata
   Modules
   Raw Dump
   Extensions
   Correlations

Signature mozilla::ReentrantMonitor::Enter() More Reports Search UUID 6a987784-94cc-48e0-aa26-02d512140906 Date Processed 2014-09-06 00:30:52.073302 Uptime 35 Last Crash 2729 seconds before submission Install Age 251499 since version was first installed. Install Time 2014-09-03 02:38:50 Product Firefox Version 32.0 Build ID 20140825202822 Release Channel release OS Windows NT OS Version 6.1.7601 Service Pack 1 Build Architecture x86 Build Architecture Info GenuineIntel family 6 model 23 stepping 7 | 4 Crash Reason EXCEPTION_ACCESS_VIOLATION_READ Crash Address 0x8 User Comments App Notes

AdapterVendorID: 0x10de, AdapterDeviceID: 0x1040, AdapterSubsysID: 00000000, AdapterDriverVersion: 9.18.13.1106 D2D? D2D+ DWrite? DWrite+ D3D10 Layers? D3D10 Layers+

Processor Notes sp-processor07_phx1_mozilla_com.9361:2012; HybridCrashProcessor EMCheckCompatibility

True

Winsock LSP

XunLei Net Monitor TCP/IP [MSAFD Tcpip [TCP/IP]] : 2 : 1 : C:\Program Files (x86)\Common Files\Thunder Network\NetMon\net_monitor2.0.2.9.dll

XunLei Net Monitor UDP/IP [MSAFD Tcpip [UDP/IP]] : 2 : 2 :  
XunLei Net Monitor RAW/IP [MSAFD Tcpip [RAW/IP]] : 2 : 3 : C:\Program Files (x86)\Common Files\Thunder Network\NetMon\net_monitor2.0.2.9.dll 
MSAFD Tcpip [TCP/IP] : 2 : 1 : %SystemRoot%\system32\mswsock.dll 
MSAFD Tcpip [UDP/IP] : 2 : 2 :  
MSAFD Tcpip [RAW/IP] : 2 : 3 : %SystemRoot%\system32\mswsock.dll 
MSAFD Tcpip [TCP/IPv6] : 2 : 1 :  
MSAFD Tcpip [UDP/IPv6] : 2 : 2 : %SystemRoot%\system32\mswsock.dll 
MSAFD Tcpip [RAW/IPv6] : 2 : 3 :  
RSVP TCPv6 Service Provider : 2 : 1 : %SystemRoot%\system32\mswsock.dll 
RSVP TCP Service Provider : 2 : 1 :  
RSVP UDPv6 Service Provider : 2 : 2 : %SystemRoot%\system32\mswsock.dll 
RSVP UDP Service Provider : 2 : 2 :  
XunLei Net Monitor : 2 : 3 : 

Adapter Vendor ID

0x10de

Adapter Device ID

0x1040

Total Virtual Memory

4294836224

Available Virtual Memory

3592466432

System Memory Use Percentage

53

Available Page File

3778068480

Available Physical Memory

2004606976

Bugzilla - Report this bug in Firefox Core Plugins Toolkit Related Bugs

   959007VERIFIED FIXED firefox crashes when starting html5 web player
   948049NEW --- crash in mozilla::ReentrantMonitor::Enter() via mozilla::MediaCacheStream::Close

Crashing Thread Frame Module Signature Source 0 xul.dll mozilla::ReentrantMonitor::Enter() obj-firefox/dist/include/mozilla/ReentrantMonitor.h 1 xul.dll mozilla::ReentrantMonitorAutoEnter::ReentrantMonitorAutoEnter(mozilla::ReentrantMonitor&) obj-firefox/dist/include/mozilla/ReentrantMonitor.h 2 xul.dll mozilla::MediaCacheStream::Close() content/media/MediaCache.cpp 3 xul.dll mozilla::ChannelMediaResource::Close() content/media/MediaResource.cpp 4 xul.dll mozilla::MediaDecoder::Shutdown() content/media/MediaDecoder.cpp 5 xul.dll mozilla::ShutdownMediaDecoder content/media/MediaShutdownManager.cpp 6 xul.dll nsTHashtable<nsPresArena::FreeList>::s_EnumStub(PLDHashTable*, PLDHashEntryHdr*, unsigned int, void*) obj-firefox/dist/include/nsTHashtable.h 7 xul.dll PL_DHashTableEnumerate(PLDHashTable*, PLDHashOperator (*)(PLDHashTable*, PLDHashEntryHdr*, unsigned int, void*), void*) xpcom/glue/pldhash.cpp 8 xul.dll nsTHashtable<nsRefPtrHashKey<mozilla::MediaDecoder> >::EnumerateEntries(PLDHashOperator (*)(nsRefPtrHashKey<mozilla::MediaDecoder>*, void*), void*) obj-firefox/dist/include/nsTHashtable.h 9 xul.dll mozilla::MediaShutdownManager::Shutdown() content/media/MediaShutdownManager.cpp 10 xul.dll mozilla::MediaShutdownManager::Observe(nsISupports*, char const*, wchar_t const*) content/media/MediaShutdownManager.cpp 11 xul.dll nsObserverList::NotifyObservers(nsISupports*, char const*, wchar_t const*) xpcom/ds/nsObserverList.cpp 12 xul.dll nsObserverService::NotifyObservers(nsISupports*, char const*, wchar_t const*) xpcom/ds/nsObserverService.cpp 13 xul.dll mozilla::ShutdownXPCOM(nsIServiceManager*) xpcom/build/nsXPComInit.cpp 14 xul.dll ScopedXPCOMStartup::~ScopedXPCOMStartup() toolkit/xre/nsAppRunner.cpp 15 xul.dll ScopedXPCOMStartup::`scalar deleting destructor'(unsigned int) 16 xul.dll XREMain::XRE_main(int, char** const, nsXREAppData const*) toolkit/xre/nsAppRunner.cpp 17 xul.dll XRE_main toolkit/xre/nsAppRunner.cpp 18 firefox.exe do_main browser/app/nsBrowserApp.cpp 19 firefox.exe NS_internal_main(int, char**) browser/app/nsBrowserApp.cpp 20 firefox.exe wmain toolkit/xre/nsWindowsWMain.cpp 21 firefox.exe __tmainCRTStartup f:/dd/vctools/crt_bld/self_x86/crt/src/crtexe.c:552 22 kernel32.dll BaseThreadInitThunk 23 ntdll.dll __RtlUserThreadStart 24 ntdll.dll _RtlUserThreadStart </p>

You can try to disable the HTML5 media player as a test.

You can toggle these prefs to false on the about:config page.

• media.directshow.enabled
• media.windows-media-foundation.enabled

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

tried, not working also, uninstall fire fox and install again, not working either

Hi macckku, you wrote:

did not play anything
I just open fire fox and check my email
and shut down, and it crash like that

Could it be the mail site??

Try navigating away from your email site to a blank tab before shutting down. To do that, you can type or paste about:blank in the address bar and press Enter to run it. (For testing, you might want to bookmark that.)

Or, if you start up Firefox to a blank tab and let that rest for 60 seconds and then shut down, do you get the same crash (same "signature")? To do that, you can use the search box on the Windows start menu. Paste this and press Enter:

firefox.exe "about:blank"