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 2.6.31-16-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I expected a flash viedo, but as soon as this site appeared on the screen Konqueror provided a crashed message.

 -- Backtrace:
Application: nspluginviewer (nspluginviewer), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fda77dd8750 (LWP 5807))]

Thread 2 (Thread 0x7fda6724b910 (LWP 5808)):
#0  0x00007fda7149782d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fda75982462 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#2  0x00007fda759784f2 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fda75981445 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fda71492a04 in start_thread () from /lib/libpthread.so.0
#5  0x00007fda747cf7bd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fda77dd8750 (LWP 5807)):
[KCrash Handler]
#5  0x0000000000000000 in ?? ()
#6  0x00007fda6745f424 in nsPluginInstance::getCurrentPageURL() const () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#7  0x00007fda6745fadc in nsPluginInstance::startProc(unsigned long) () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#8  0x00007fda674605c1 in nsPluginInstance::NewStream(char*, _NPStream*, unsigned char, unsigned short*) () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#9  0x0000000000409894 in ?? ()
#10 0x0000000000411983 in ?? ()
#11 0x0000000000411e99 in ?? ()
#12 0x0000000000411f34 in ?? ()
#13 0x000000000041217f in ?? ()
#14 0x00007fda75a7cddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x00007fda768f82d4 in KIO::TransferJob::data(KIO::Job*, QByteArray const&) () from /usr/lib/libkio.so.5
#16 0x00007fda768fdb86 in KIO::TransferJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#17 0x00007fda75a7cddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#18 0x00007fda769bc072 in KIO::SlaveInterface::data(QByteArray const&) () from /usr/lib/libkio.so.5
#19 0x00007fda769bfbb8 in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib/libkio.so.5
#20 0x00007fda769bc333 in KIO::SlaveInterface::dispatch() () from /usr/lib/libkio.so.5
#21 0x00007fda769af14d in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#22 0x00007fda769b126c in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#23 0x00007fda75a7cddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#24 0x00007fda768cbf57 in ?? () from /usr/lib/libkio.so.5
#25 0x00007fda768cc07d in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#26 0x00007fda75a770f9 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x00007fda74f0fefc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#28 0x00007fda74f171ce in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#29 0x00007fda7640aab6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#30 0x00007fda75a67c2c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#31 0x00007fda75a6880a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#32 0x00007fda75a90533 in ?? () from /usr/lib/libQtCore.so.4
#33 0x00007fda76d0fbbe in g_main_dispatch (context=0x1199120) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:1960
#34 IA__g_main_context_dispatch (context=0x1199120) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2513
#35 0x00007fda76d13588 in g_main_context_iterate (context=0x1199120, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2591
#36 0x00007fda76d136b0 in IA__g_main_context_iteration (context=0x1199120, may_block=1) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2654
#37 0x00007fda75a901a6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#38 0x00007fda74fa44be in ?? () from /usr/lib/libQtGui.so.4
#39 0x00007fda75a66532 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0x00007fda75a66904 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#41 0x00007fda75a68ab9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#42 0x000000000041583c in ?? ()
#43 0x00007fda7470eabd in __libc_start_main () from /lib/libc.so.6
#44 0x0000000000408379 in _start ()

Reported using DrKonqi