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 x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
would not install

 -- Backtrace:
Application: nspluginviewer (nspluginviewer), signal: Segmentation fault
[KCrash Handler]
#5  0x0000000000000000 in ?? ()
#6  0x00007fa5b62cd424 in nsPluginInstance::getCurrentPageURL() const () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#7  0x00007fa5b62cdadc in nsPluginInstance::startProc(unsigned long) () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#8  0x00007fa5b62ce5c1 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 0x00007fa5c7dabddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x00007fa5c8c272d4 in KIO::TransferJob::data(KIO::Job*, QByteArray const&) () from /usr/lib/libkio.so.5
#16 0x00007fa5c8c2cb86 in KIO::TransferJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#17 0x00007fa5c7dabddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#18 0x00007fa5c8ceb072 in KIO::SlaveInterface::data(QByteArray const&) () from /usr/lib/libkio.so.5
#19 0x00007fa5c8ceebb8 in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib/libkio.so.5
#20 0x00007fa5c8ceb333 in KIO::SlaveInterface::dispatch() () from /usr/lib/libkio.so.5
#21 0x00007fa5c8cde14d in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#22 0x00007fa5c8ce026c in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#23 0x00007fa5c7dabddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#24 0x00007fa5c8bfaf57 in ?? () from /usr/lib/libkio.so.5
#25 0x00007fa5c8bfb07d in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#26 0x00007fa5c7da60f9 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x00007fa5c723eefc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#28 0x00007fa5c72461ce in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#29 0x00007fa5c8739ab6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#30 0x00007fa5c7d96c2c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#31 0x00007fa5c7d9780a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#32 0x00007fa5c7dbf533 in ?? () from /usr/lib/libQtCore.so.4
#33 0x00007fa5c903ebbe in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#34 0x00007fa5c9042588 in ?? () from /lib/libglib-2.0.so.0
#35 0x00007fa5c90426b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#36 0x00007fa5c7dbf1a6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x00007fa5c72d34be in ?? () from /usr/lib/libQtGui.so.4
#38 0x00007fa5c7d95532 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#39 0x00007fa5c7d95904 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0x00007fa5c7d97ab9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#41 0x000000000041583c in ?? ()
#42 0x00007fa5c6a3dabd in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, 
    rtld_fini=<value optimized out>, stack_end=0x7fff8ca8a038) at libc-start.c:220
#43 0x0000000000408379 in _start ()

Reported using DrKonqi