Version:            (using KDE KDE 3.5.2)
Installed from:    Fedora RPMs
OS:                Linux

To reproduce this Bug I tried a download link on sourceforge.net because I faced with this problem exactly there.I use FC4 dist, and I've managed to
reproduce this on Debian as well (I think the distribution does not matter here).

Well, how to reproduce a crash:
1. Go to http://prdownloads.sourceforge.net/madwifi/madwifi-0.9.2.tar.bz2?use_mirror=mesh

(Just an example page I used, hope that you will be able to localise the problem to use minimal page)

2. In the upper area of this page there is a note 
with link:

"Your download should begin shortly. If it does not, try http://mesh.dl.sourceforge.net/sourceforge/madwifi/madwifi-0.9.2.tar.bz2 or choose a different mirror"

The main thing here is that you should not wait until 
upload dialog box appears, but click on this link.
(IMPORTANT: you should manage to click on the link before "save us" dialog box appears);

3. Wait a bit until a new page is rendered and 
dialog box appears.
Then click on "save as" button, after which you should get a crash!

-----------------
Do not know if that help you, but here is a crash dump:

(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
`shared object read from target memory' has disappeared; keeping its symbols.
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[Thread debugging using libthread_db enabled]
[New Thread -1208698016 (LWP 24944)]
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[KCrash handler]
#6  0x0067e65c in KParts::BrowserRun::handleNonEmbeddable ()
   from /usr/lib/libkparts.so.2
#7  0x07ac75b1 in KonqRun::foundMimeType ()
   from /usr/lib/libkdeinit_konqueror.so
#8  0x0067daea in KParts::BrowserRun::slotBrowserMimetype ()
   from /usr/lib/libkparts.so.2
#9  0x0067db82 in KParts::BrowserRun::qt_invoke () from /usr/lib/libkparts.so.2
#10 0x07ac7b71 in KonqRun::qt_invoke () from /usr/lib/libkdeinit_konqueror.so
#11 0x01215154 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#12 0x00c0b8a7 in KIO::TransferJob::mimetype () from /usr/lib/libkio.so.4
#13 0x00c0b90a in KIO::TransferJob::slotMimetype () from /usr/lib/libkio.so.4
#14 0x00c0de3e in KIO::TransferJob::qt_invoke () from /usr/lib/libkio.so.4
#15 0x01215154 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#16 0x01215b12 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#17 0x00bfd579 in KIO::SlaveInterface::mimeType () from /usr/lib/libkio.so.4
#18 0x00bfdcf7 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#19 0x00bfcb4d in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#20 0x00bf9fe0 in KIO::Slave::gotInput () from /usr/lib/libkio.so.4
#21 0x00bfa175 in KIO::Slave::qt_invoke () from /usr/lib/libkio.so.4
#22 0x01215154 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#23 0x0121577a in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#24 0x0158ce46 in QSocketNotifier::activated ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#25 0x01234ca5 in QSocketNotifier::event ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#26 0x011b074d in QApplication::internalNotify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#27 0x011b109c in QApplication::notify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#28 0x001c56c1 in KApplication::notify () from /usr/lib/libkdecore.so.4
#29 0x011a4199 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#30 0x0115ab7a in QEventLoop::processEvents ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#31 0x011c8db2 in QEventLoop::enterLoop ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#32 0x011c8cd6 in QEventLoop::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#33 0x011b0119 in QApplication::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#34 0x07abc769 in kdemain () from /usr/lib/libkdeinit_konqueror.so
#35 0x00643540 in kdeinitmain () from /usr/lib/kde3/konqueror.so
#36 0x0804dee3 in ?? ()
#37 0x0804e585 in ?? ()
#38 0x0804eb0c in ?? ()
#39 0x0804fbd3 in ?? ()
#40 0x0085fd7f in __libc_start_main () from /lib/libc.so.6
#41 0x0804b881 in ?? ()