It's #30 top browser crasher in 14.0b6. Here are correlations per module: mpk.dll@0x147fb|EXCEPTION_ACCESS_VIOLATION_READ (68 crashes) 94% (64/68) vs. 0% (84/23847) Mpk.dll 10% (7/68) vs. 0% (15/23847) MPK.dll It's a keylogger: http://www.threatexpert.com/report.aspx?md5=05ce8542a17a92090e8bd1f964348dc5 Signature mpk.dll@0x147fb More Reports Search UUID 3c12df71-d56e-4d70-b07f-95c712120607 Date Processed 2012-06-07 21:06:55 Uptime 9660 Last Crash 2.7 hours before submission Install Age 7.9 hours since version was first installed. Install Time 2012-06-07 13:12:30 Product Firefox Version 14.0 Build ID 20120605113340 Release Channel beta OS Windows NT OS Version 6.1.7601 Service Pack 1 Build Architecture x86 Build Architecture Info GenuineIntel family 6 model 42 stepping 7 Crash Reason EXCEPTION_ACCESS_VIOLATION_READ Crash Address 0x14b18000 App Notes AdapterVendorID: 0x1002, AdapterDeviceID: 0x68f9, AdapterSubsysID: 00000000, AdapterDriverVersion: 8.961.0.0 D2D? D2D+ DWrite? DWrite+ D3D10 Layers? D3D10 Layers+ EMCheckCompatibility True Total Virtual Memory 4294836224 Available Virtual Memory 3646238720 System Memory Use Percentage 40 Available Page File 6104662016 Available Physical Memory 2547339264 Frame Module Signature Source 0 Mpk.dll Mpk.dll@0x147fb 1 Mpk.dll Mpk.dll@0x8513 2 Mpk.dll Mpk.dll@0x2e803 3 Mpk.dll Mpk.dll@0x85f6 4 Mpk.dll Mpk.dll@0x8680 5 nspr4.dll SocketWrite nsprpub/pr/src/io/prsocket.c:701 6 nspr4.dll nspr4.dll@0x2a3f 7 xul.dll nsSocketOutputStream::Write netwerk/base/src/nsSocketTransport2.cpp:587 8 xul.dll nsHttpConnection::OnReadSegment netwerk/protocol/http/nsHttpConnection.cpp:1190 9 xul.dll nsHttpPipeline::ReadFromPipe netwerk/protocol/http/nsHttpPipeline.cpp:682 10 xul.dll nsPipeInputStream::ReadSegments xpcom/io/nsPipe3.cpp:799 11 xul.dll nsHttpPipeline::ReadSegments netwerk/protocol/http/nsHttpPipeline.cpp:726 12 xul.dll nsHttpConnection::OnSocketWritable netwerk/protocol/http/nsHttpConnection.cpp:1251 13 xul.dll nsHttpConnection::OnOutputStreamReady netwerk/protocol/http/nsHttpConnection.cpp:1530 14 xul.dll nsHttpConnection::Activate netwerk/protocol/http/nsHttpConnection.cpp:396 15 xul.dll nsHttpConnectionMgr::DispatchTransaction netwerk/protocol/http/nsHttpConnectionMgr.cpp:1512 16 xul.dll nsHttpConnectionMgr::TryDispatchTransaction netwerk/protocol/http/nsHttpConnectionMgr.cpp:1432 17 xul.dll nsHttpConnectionMgr::ProcessPendingQForEntry netwerk/protocol/http/nsHttpConnectionMgr.cpp:914 18 xul.dll nsHttpConnectionMgr::OnMsgProcessPendingQ netwerk/protocol/http/nsHttpConnectionMgr.cpp:1852 19 xul.dll nsHttpConnectionMgr::OnMsgReclaimConnection netwerk/protocol/http/nsHttpConnectionMgr.cpp:1969 20 xul.dll nsHttpConnectionMgr::nsHalfOpenSocket::OnOutputStreamReady netwerk/protocol/http/nsHttpConnectionMgr.cpp:2501 21 xul.dll nsSocketOutputStream::OnSocketReady netwerk/base/src/nsSocketTransport2.cpp:525 22 xul.dll nsSocketTransport::OnSocketReady netwerk/base/src/nsSocketTransport2.cpp:1568 23 xul.dll nsSocketTransportService::DoPollIteration netwerk/base/src/nsSocketTransportService2.cpp:762 24 xul.dll nsSocketTransportService::Run netwerk/base/src/nsSocketTransportService2.cpp:645 25 xul.dll nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:656 26 xul.dll nsThread::ThreadFunc xpcom/threads/nsThread.cpp:289 27 nspr4.dll _PR_NativeRunThread nsprpub/pr/src/threads/combined/pruthr.c:426 28 nspr4.dll pr_root nsprpub/pr/src/md/windows/w95thred.c:122 29 msvcr100.dll _callthreadstartex f:\dd\vctools\crt_bld\self_x86\crt\src\threadex.c:314 30 msvcr100.dll _threadstartex f:\dd\vctools\crt_bld\self_x86\crt\src\threadex.c:292 31 kernel32.dll BaseThreadInitThunk 32 ntdll.dll __RtlUserThreadStart 33 ntdll.dll _RtlUserThreadStart More reports at: https://crash-stats.mozilla.com/report/list?signature=mpk.dll%400x147fb

interesting that a key logger can be a top 30 crash :( I think this is a dup of 671468.. The pipeline changes in FF14 have changed the stack a little bit, but the underlying pattern is still the same. not a new issue.