See following bug reports:
https://bugzilla.mozilla.org/show_bug.cgi?id=610610
http://forums.freebsd.org/showthread.php?p=109169
Backtrace:
(gdb) bt
#0 RealBreak () at nsDebugImpl.cpp:421
#1 0x0000000801c399da in NS_DebugBreak_P (aSeverity=3,
aStr=0x8155495c8 "X_ShmCreatePixmap: BadImplementation (server does not implement operation); 2 requests ago; id=0x4200003", aExpr=0x0,
aFile=0x801cce3b0 "nsX11ErrorHandler.cpp", aLine=182) at nsDebugImpl.cpp:324
#2 0x0000000800ae90a3 in X11Error (display=0x813151000, event=0x7fffffffd7b0) at nsX11ErrorHandler.cpp:182
#3 0x0000000804c841c5 in _XError () from /usr/local/lib/libX11.so.6
#4 0x0000000804c8a944 in process_responses () from /usr/local/lib/libX11.so.6
#5 0x0000000804c8aed7 in _XReply () from /usr/local/lib/libX11.so.6
#6 0x0000000804c8009a in XSync () from /usr/local/lib/libX11.so.6
#7 0x000000081920383d in FlashGraphicInitX11 (This=0x812a5c240) at plugin.c:789
#8 0x0000000819202e28 in NPP_Write (instance=0x811bcd530, stream=0x8155499c8, offset=0, len=7607, buffer=0x814a77000) at plugin.c:405
#9 0x0000000819203e0c in Private_Write (instance=0x811bcd530, stream=0x8155499c8, offset=0, len=7607, buffer=0x814a77000) at npunix.c:223
#10 0x00000008018db128 in nsNPAPIPluginStreamListener::OnDataAvailable (this=0x815549980, pluginInfo=Variable "pluginInfo" is not available.
) at nsNPAPIPluginInstance.cpp:669
#11 0x00000008018e0843 in nsPluginStreamListenerPeer::OnDataAvailable (this=0x812277500, request=0x8136fcf50, aContext=Variable "aContext" is not available.
) at nsPluginHost.cpp:1955
#12 0x0000000800c82bef in nsStreamListenerWrapper::OnDataAvailable (this=0x814607600, aRequest=0x8136fcf50, aContext=0x0, aInputStream=0x81470c200, aOffset=0,
aCount=7607) at nsHttpChannel.cpp:5962
#13 0x0000000800be0dda in nsStreamListenerTee::OnDataAvailable (this=0x81470c440, request=0x8136fcf50, context=0x0, input=0x81470c240, offset=0, count=7607)
at nsStreamListenerTee.cpp:108
#14 0x0000000800be0dda in nsStreamListenerTee::OnDataAvailable (this=0x81470c6c0, request=0x8136fcf50, context=0x0, input=0x814770758, offset=0, count=7607)
at nsStreamListenerTee.cpp:108
#15 0x0000000800c6e045 in nsHttpChannel::OnDataAvailable (this=0x8136fcf00, request=Variable "request" is not available.
) at nsHttpChannel.cpp:5391
#16 0x0000000800bb7c71 in nsInputStreamPump::OnStateTransfer (this=0x811b1a280) at nsInputStreamPump.cpp:510
#17 0x0000000800bb8231 in nsInputStreamPump::OnInputStreamReady (this=0x811b1a280, stream=Variable "stream" is not available.
) at nsInputStreamPump.cpp:400
#18 0x0000000801c0c06a in nsInputStreamReadyEvent::Run (this=0x814665c40) at nsStreamUtils.cpp:112
#19 0x0000000801c2c8ed in nsThread::ProcessNextEvent (this=0x8075044c0, mayWait=1, result=0x7fffffffe01c) at nsThread.cpp:527
#20 0x0000000801bdc701 in NS_ProcessNextEvent_P (thread=Variable "thread" is not available.
) at nsThreadUtils.cpp:250
#21 0x0000000801aa26ae in nsBaseAppShell::Run (this=0x80a65a550) at nsBaseAppShell.cpp:177
#22 0x0000000801830b63 in nsAppStartup::Run (this=0x80a7ff5b0) at nsAppStartup.cpp:183
#23 0x0000000800add660 in XRE_main (argc=Variable "argc" is not available.
) at nsAppRunner.cpp:3483
#24 0x00000000004013dd in main (argc=1, argv=0x7fffffffe6e8) at nsBrowserApp.cpp:158
Version:
libflash-0.4.13_5 GPL Flash (TM) Library
Couldn't find newer one.
(gdb) bt
#0 RealBreak () at nsDebugImpl.cpp:421
#1 0x0000000801c399da in NS_DebugBreak_P (aSeverity=3,
aStr=0x816c2c188 "X_ShmCreatePixmap: BadImplementation (server does not implement operation); 2 requests ago; id=0x4200003", aExpr=0x0,
aFile=0x801cce3b0 "nsX11ErrorHandler.cpp", aLine=182) at nsDebugImpl.cpp:324
#2 0x0000000800ae90a3 in X11Error (display=0x816179000, event=0x7fffffffd770) at nsX11ErrorHandler.cpp:182
#3 0x0000000804c9be97 in _XError (dpy=0x816179000, rep=0x8143c7940) at XlibInt.c:3101
#4 0x0000000804ca4b1d in process_responses (dpy=0x816179000, wait_for_first_event=0, current_error=0x7fffffffd900, current_request=32) at xcb_io.c:214
#5 0x0000000804ca5558 in _XReply (dpy=0x816179000, rep=0x7fffffffd950, extra=0, discard=1) at xcb_io.c:464
#6 0x0000000804c93c34 in XSync (dpy=0x816179000, discard=0) at Sync.c:46
#7 0x000000081844f83d in FlashGraphicInitX11 (This=0x814282c40) at plugin.c:789
GPLFlash isn't maintained anymore. Instead try gnash or lightspark