Sorry about the previous non-traces, I forgot to run bt (hadn't used gdb before
this)...here is one with a trace (from a hang while using the scroll bar (traced
before forcing it closed) and subsequent refusal to restart).  {...} are my
comments.

Also included is an APT error I keep getting while trying to build an unstripped
Firefox; is there a problem at the server end?

At the end is a previous series of refusals to start, from which I forgot to
obtain proper traces, but am concerned about the appearance of "js" when I have
JavaScript turned off (though it could well be something else, my home page
https://webmail.ox.ac.uk doesn't contain any JavaScript anyway).

[EMAIL PROTECTED]:~$ DEB_BUILD_OPTIONS=nostrip fakeroot apt-get -b source
mozilla-firefox
Reading Package Lists... Done
Building Dependency Tree... Done
Need to get 40.6MB of source archives.
Get:1 http://security.debian.org stable/updates/main mozilla-firefox
1.0.4-2sarge11 (dsc) [1003B]
{long pause with progress indicator at 100% of next file}
Get:2 http://security.debian.org stable/updates/main mozilla-firefox
1.0.4-2sarge11 (tar) [40.2MB] 
Get:3 http://security.debian.org stable/updates/main mozilla-firefox
1.0.4-2sarge11 (diff) [419kB]
Err http://security.debian.org stable/updates/main mozilla-firefox
1.0.4-2sarge11 (diff)
  Error reading from server Remote end closed connection [IP: 212.211.132.250 
80]
Fetched 40.2MB in 7m30s (89.4kB/s)
Failed to fetch
http://security.debian.org/pool/updates/main/m/mozilla-firefox/mozilla-firefox_1.0.4-2sarge11.diff.gz
 Error reading from server Remote end closed connection [IP: 212.211.132.250 80]
E: Failed to fetch some archives.
[EMAIL PROTECTED]:~$ firefox -g GNU gdb 6.3-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-linux"...(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) set pagination 0
(gdb) run
Starting program: /usr/lib/mozilla-firefox/firefox-bin -a firefox
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 1086687264 (LWP 3579)]
(no debugging symbols found)
(no debugging symbols found)
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(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[New Thread 1097067440 (LWP 3582)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
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(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[New Thread 1109760944 (LWP 3583)]
[New Thread 1118149552 (LWP 3584)]
[New Thread 1128266672 (LWP 3585)]
(no debugging symbols found)
(no debugging symbols found)
[New Thread 1136966576 (LWP 3586)]
(no debugging symbols found)
[New Thread 1145551792 (LWP 3587)]
[Thread 1145551792 (LWP 3587) exited]
(no debugging symbols found)
[New Thread 1145551792 (LWP 3588)]
(no debugging symbols found)
[Thread 1136966576 (LWP 3586) exited]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1086687264 (LWP 3579)]
0x40136328 in nsAString::Equals () from /usr/lib/mozilla-firefox/libxpcom.so
(gdb) thread apply all bt

Thread 8 (Thread 1145551792 (LWP 3588)):
#0  0x401a2440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1  0x4017e664 in PR_Unlock () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x4017e85e in PR_WaitCondVar () from /usr/lib/mozilla-firefox/libnspr4.so
#3  0x083c2889 in nsIOThreadPool::ThreadFunc ()
#4  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#5  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#6  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 5 (Thread 1128266672 (LWP 3585)):
#0  0x401a2440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1  0x4017e664 in PR_Unlock () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x4017e85e in PR_WaitCondVar () from /usr/lib/mozilla-firefox/libnspr4.so
#3  0x083c2889 in nsIOThreadPool::ThreadFunc ()
#4  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#5  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#6  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 4 (Thread 1118149552 (LWP 3584)):
#0  0x401a2440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1  0x4017e664 in PR_Unlock () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x4017e85e in PR_WaitCondVar () from /usr/lib/mozilla-firefox/libnspr4.so
#3  0x401201ab in TimerThread::UpdateFilter () from
/usr/lib/mozilla-firefox/libxpcom.so
#4  0x4011d73b in nsThread::Main () from /usr/lib/mozilla-firefox/libxpcom.so
#5  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#6  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#7  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 3 (Thread 1109760944 (LWP 3583)):
#0  0x401a2440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1  0x4017e664 in PR_Unlock () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x4017e85e in PR_WaitCondVar () from /usr/lib/mozilla-firefox/libnspr4.so
#3  0x083c2889 in nsIOThreadPool::ThreadFunc ()
#4  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#5  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#6  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 2 (Thread 1097067440 (LWP 3582)):
#0  0x40abd523 in poll () from /lib/tls/libc.so.6
#1  0x401829a9 in PR_OpenDir () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x083d9404 in nsSocketTransportService::Poll ()
#3  0x083d9966 in nsSocketTransportService::ServiceEventQ ()
#4  0x4011d73b in nsThread::Main () from /usr/lib/mozilla-firefox/libxpcom.so
#5  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#6  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#7  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 1 (Thread 1086687264 (LWP 3579)):
#0  0x40136328 in nsAString::Equals () from
/usr/lib/mozilla-firefox/libxpcom.so#1  0x087ab138 in
nsXULElement::HandleDOMEvent ()
#2  0x08590f47 in PresShell::HandleEventInternal ()
#3  0x085907f1 in PresShell::RetargetEventToParent ()
#4  0x08756f20 in nsViewManager::HandleEvent ()
#5  0x08756386 in nsViewManager::UpdateViews ()
#6  0x0874f0b8 in HandleNumbers ()
#7  0x0856c319 in nsCommonWidget::DispatchResizeEvent ()
#8  0x08564feb in nsWindow::OnMotionNotifyEvent ()
#9  0x08569440 in nsWindow::DragInProgress ()
#10 0x08fe6fd0 in ?? ()
#11 0x08fbc148 in ?? ()
#12 0x405be708 in ?? () from /usr/lib/libgobject-2.0.so.0
#13 0x40486e34 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#14 0x40486e34 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#15 0xbfffece8 in ?? ()
#16 0x402d099e in _gtk_marshal_BOOLEAN__BOXED () from 
/usr/lib/libgtk-x11-2.0.so.0
Previous frame inner to this frame (corrupt stack?)
{Attempting to close from the taskbar brought up "stopped responding" message;
selected Force Quit}
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb) run
Starting program: /usr/lib/mozilla-firefox/firefox-bin -a firefox
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 1086687264 (LWP 3681)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
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(no debugging symbols found)
(no debugging symbols found)
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(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[New Thread 1097067440 (LWP 3682)]
(no debugging symbols found)
(no debugging symbols found)
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(no debugging symbols found)
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(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[New Thread 1109760944 (LWP 3683)]
[New Thread 1118149552 (LWP 3684)]
[New Thread 1126538160 (LWP 3685)]
(no debugging symbols found)

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1086687264 (LWP 3681)]
0x40136328 in nsAString::Equals () from /usr/lib/mozilla-firefox/libxpcom.so
(gdb) thread apply all bt

Thread 5 (Thread 1126538160 (LWP 3685)):
#0  0x401a2440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1  0x4017e664 in PR_Unlock () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x4017e85e in PR_WaitCondVar () from /usr/lib/mozilla-firefox/libnspr4.so
#3  0x083c2889 in nsIOThreadPool::ThreadFunc ()
#4  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#5  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#6  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 4 (Thread 1118149552 (LWP 3684)):
#0  0x401a2440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1  0x4017e664 in PR_Unlock () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x4017e85e in PR_WaitCondVar () from /usr/lib/mozilla-firefox/libnspr4.so
#3  0x401201ab in TimerThread::UpdateFilter () from
/usr/lib/mozilla-firefox/libxpcom.so
#4  0x4011d73b in nsThread::Main () from /usr/lib/mozilla-firefox/libxpcom.so
#5  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#6  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#7  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 3 (Thread 1109760944 (LWP 3683)):
#0  0x401a2440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1  0x4017e664 in PR_Unlock () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x4017e85e in PR_WaitCondVar () from /usr/lib/mozilla-firefox/libnspr4.so
#3  0x083c2889 in nsIOThreadPool::ThreadFunc ()
#4  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#5  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#6  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 2 (Thread 1097067440 (LWP 3682)):
#0  0x40abd523 in poll () from /lib/tls/libc.so.6
#1  0x401829a9 in PR_OpenDir () from /usr/lib/mozilla-firefox/libnspr4.so
#2  0x083d9404 in nsSocketTransportService::Poll ()
#3  0x083d9966 in nsSocketTransportService::ServiceEventQ ()
#4  0x4011d73b in nsThread::Main () from /usr/lib/mozilla-firefox/libxpcom.so
#5  0x40183fe9 in PR_Select () from /usr/lib/mozilla-firefox/libnspr4.so
#6  0x4019fb63 in start_thread () from /lib/tls/libpthread.so.0
#7  0x40ac618a in clone () from /lib/tls/libc.so.6

Thread 1 (Thread 1086687264 (LWP 3681)):
#0  0x40136328 in nsAString::Equals () from
/usr/lib/mozilla-firefox/libxpcom.so#1  0x087ab138 in
nsXULElement::HandleDOMEvent ()
#2  0x08590f47 in PresShell::HandleEventInternal ()
#3  0x08590db5 in PresShell::RetargetEventToParent ()
#4  0x087f8ab7 in nsGfxScrollFrameInner::CurPosAttributeChanged ()
#5  0x085f4e5f in nsScrollbarFrame::IsContainingBlock ()
#6  0x085b0a97 in nsCSSFrameConstructor::AttributeChanged ()
#7  0x0858f800 in PresShell::AttributeChanged ()
#8  0x0863c0e8 in nsDocument::AttributeChanged ()
#9  0x086d3cca in nsHTMLDocument::AttributeChanged ()
#10 0x087a940e in nsXULElement::SetAttrAndNotify ()
#11 0x087a90d2 in nsXULElement::SetAttr ()
#12 0x085f65ed in nsSliderFrame::GetIntegerAttribute ()
#13 0x085b0a97 in nsCSSFrameConstructor::AttributeChanged ()
#14 0x0858f800 in PresShell::AttributeChanged ()
#15 0x0863c0e8 in nsDocument::AttributeChanged ()
#16 0x086d3cca in nsHTMLDocument::AttributeChanged ()
#17 0x087a940e in nsXULElement::SetAttrAndNotify ()
#18 0x087a90d2 in nsXULElement::SetAttr ()
#19 0x088b4535 in nsXBLPrototypeBinding::AttributeChanged ()
#20 0x088b1dfb in nsXBLBinding::InstallAnonymousContent ()
#21 0x087a93c2 in nsXULElement::SetAttrAndNotify ()
#22 0x087a90d2 in nsXULElement::SetAttr ()
#23 0x087fa032 in nsGfxScrollFrameInner::SetAttribute ()
#24 0x087f9882 in nsGfxScrollFrameInner::Layout ()
#25 0x087f9093 in nsGfxScrollFrameInner::LayoutBox ()
#26 0x085e8ae0 in nsBox::UnCollapseChild ()
#27 0x085ebfe7 in nsBoxFrame::IsInitialReflowForPrintPreview ()
#28 0x087f8449 in nsGfxScrollFrame::GetScrollbarStyles ()
#29 0x087f5c2d in nsContainerFrame::ReflowChild ()
#30 0x088220b9 in ViewportFrame::AdjustReflowStateForScrollbars ()
#31 0x0858a5f0 in PresShell::SetPrefFocusRules ()
#32 0x088502e7 in nsContentSink::StartLayout ()
#33 0x086cc6a0 in HTMLContentSink::StartLayout ()
#34 0x086cad85 in HTMLContentSink::Init ()
#35 0x0849bafc in CNavDTD::OpenBody ()
#36 0x0849bdf3 in CNavDTD::OpenContainer ()
#37 0x08498bcf in CNavDTD::HandleDefaultStartToken ()
#38 0x08499846 in CNavDTD::HandleStartToken ()
#39 0x08497ecb in CNavDTD::BuildNeglectedTarget ()
#40 0x08497564 in CNavDTD::~CNavDTD ()
#41 0x084addad in nsParser::ResumeParse ()
#42 0x084adb00 in nsParser::ResumeParse ()
#43 0x084aedc5 in nsParser::DetectMetaTag ()
#44 0x0890ed8d in nsDocumentOpenInfo::Open ()
#45 0x083c805d in nsInputStreamChannel::~nsInputStreamChannel ()
#46 0x083c8e7b in nsInputStreamPump::OnStateTransfer ()
#47 0x083c8cdf in nsInputStreamPump::EnsureWaiting ()
#48 0x40103c31 in nsInputStreamReadyEvent::EventHandler () from
/usr/lib/mozilla-firefox/libxpcom.so
#49 0x4011a277 in PL_HandleEvent () from /usr/lib/mozilla-firefox/libxpcom.so
#50 0x4011a1a4 in PL_ProcessPendingEvents () from
/usr/lib/mozilla-firefox/libxpcom.so
#51 0x4011be39 in nsEventQueueImpl::NotifyObservers () from
/usr/lib/mozilla-firefox/libxpcom.so
#52 0x0856b155 in nsBaseWidget::FreeNativeData ()
#53 0x4060cdbf in g_vasprintf () from /usr/lib/libglib-2.0.so.0
#54 0x405e7582 in g_main_depth () from /usr/lib/libglib-2.0.so.0
#55 0x405e85f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#56 0x405e8930 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#57 0x405e8ed3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#58 0x402cdbb3 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#59 0x0856b498 in nsAppShell::ReleaseGlobals ()
#60 0x08a15144 in nsAppShellService::AttemptingQuit ()
#61 0x08c1a7d0 in xre_main ()
#62 0x0834c004 in main ()
(gdb) quit
The program is running.  Exit anyway? (y or n) y
[EMAIL PROTECTED]:~$

The following is a previous series of refusals to start, from which I forgot to
obtain proper traces, but am concerned about the appearance of "js" when I have
JavaScript turned off.
{...}
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1086683168 (LWP 3819)]
0x40045148 in js_EmitTree () from /usr/lib/mozilla-firefox/libmozjs.so
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
{...}
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1086683168 (LWP 3959)]
0x40045148 in js_EmitTree () from /usr/lib/mozilla-firefox/libmozjs.so
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb) run
{...}
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1086683168 (LWP 3968)]
0x40045148 in js_EmitTree () from /usr/lib/mozilla-firefox/libmozjs.so
(gdb) quit
The program is running.  Exit anyway? (y or n) y
[EMAIL PROTECTED]:~$


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