Application that crashed: nspluginviewer
Version of the application: 
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic-pae i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I was watching Youtube and i clicked on a video to watch and just while starting to stream i got this bug

 -- Backtrace:
Application: nspluginviewer (nspluginviewer), signal: Segmentation fault
[Current thread is 1 (Thread 0xb773e700 (LWP 2961))]

Thread 3 (Thread 0xb5104b70 (LWP 4410)):
#0  0x008d4422 in __kernel_vsyscall ()
#1  0x00a25e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x007c578d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0707378f in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#4  0x071a4b3f in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#5  0x07073c3d in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#6  0x00a2180e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x007b87ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xb4903b70 (LWP 4411)):
#0  0x008d4422 in __kernel_vsyscall ()
#1  0x00a25e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x007c578d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0707378f in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#4  0x071a4b3f in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#5  0x07073c3d in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#6  0x00a2180e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x007b87ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb773e700 (LWP 2961)):
[KCrash Handler]
#6  0x001d9046 in g_slice_alloc () from /lib/libglib-2.0.so.0
#7  0x001d9705 in g_slice_alloc0 () from /lib/libglib-2.0.so.0
#8  0x08f628d7 in g_type_create_instance () from /usr/lib/libgobject-2.0.so.0
#9  0x08f47748 in ?? () from /usr/lib/libgobject-2.0.so.0
#10 0x08f48b62 in g_object_newv () from /usr/lib/libgobject-2.0.so.0
#11 0x08f4958a in g_object_new_valist () from /usr/lib/libgobject-2.0.so.0
#12 0x08f4970e in g_object_new () from /usr/lib/libgobject-2.0.so.0
#13 0x01e697ac in gtk_plug_new_for_display () from /usr/lib/libgtk-x11-2.0.so.0
#14 0x01e697f6 in gtk_plug_new () from /usr/lib/libgtk-x11-2.0.so.0
#15 0x070669cd in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#16 0x0705c581 in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#17 0x07060db4 in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#18 0x08050358 in ?? ()
#19 0x0805e4b3 in ?? ()
#20 0x0805d805 in ?? ()
#21 0x08056a1f in ?? ()
#22 0x0805eb9c in ?? ()
#23 0x001317b4 in ?? () from /usr/lib/libQtDBus.so.4
#24 0x0013295d in ?? () from /usr/lib/libQtDBus.so.4
#25 0x00133234 in ?? () from /usr/lib/libQtDBus.so.4
#26 0x001334da in ?? () from /usr/lib/libQtDBus.so.4
#27 0x04adb5fe in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#28 0x0131bf54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#29 0x0132367c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#30 0x0103bbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#31 0x04acb6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#32 0x04acc2b2 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#33 0x04acc47d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#34 0x04af63ff in ?? () from /usr/lib/libQtCore.so.4
#35 0x001bae78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#36 0x001be720 in ?? () from /lib/libglib-2.0.so.0
#37 0x001be853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#38 0x04af602c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#39 0x013bcbe5 in ?? () from /usr/lib/libQtGui.so.4
#40 0x04ac9c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#41 0x04aca0ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#42 0x04acc53f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#43 0x0131bdd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#44 0x0805c7c0 in ?? ()
#45 0x00702b56 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#46 0x0804e591 in _start ()

Reported using DrKonqi