I can't see what lauchpad has done with the attachment, so I'm adding it 
inline this time.

GNU gdb 6.4.90-debian
Copyright (C) 2006 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.
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There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...Using host libthread_db 
library "/lib/tls/i686/cmov/libthread_db.so.1".

(gdb) run
Starting program: /usr/lib/firefox/firefox-bin -a firefox
[Thread debugging using libthread_db enabled]
[New Thread -1220400240 (LWP 13278)]
[New Thread -1223697504 (LWP 13281)]
[New Thread -1233982560 (LWP 13282)]
[New Thread -1255441504 (LWP 13285)]
[New Thread -1265308768 (LWP 13288)]
[New Thread -1273701472 (LWP 13289)]
[New Thread -1282094176 (LWP 13290)]
[New Thread -1294160992 (LWP 13291)]
[New Thread -1302553696 (LWP 13292)]
[Thread -1302553696 (LWP 13292) exited]
[New Thread -1310946400 (LWP 13293)]
[Thread -1310946400 (LWP 13293) exited]
[New Thread -1310946400 (LWP 13294)]
[New Thread -1302553696 (LWP 13297)]
[New Thread -1322685536 (LWP 13298)]
[New Thread -1332741216 (LWP 13302)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1220400240 (LWP 13278)]
0xb5b14089 in nsXMLHttpRequest::StreamReaderFunc (in=0xafc6d468,
     closure=0xafd49100,
     fromRawSegment=0x871109c "<?xml version=\"1.0\" 
encoding=\"utf-8\"?><response><uid>00f3ab24-0001-0000-0000-", '0' 
<repeats 12 times>, "</uid><tid>851430</tid><suggestions>Sudbury, 
Suffolk|Sudbury, Suffolk.</suggestions><complete>true</complete></"..., 
toOffset=0, count=233, writeCount=0xbfd16494)
     at nsXMLHttpRequest.cpp:1177
1177	nsXMLHttpRequest.cpp: No such file or directory.
	in nsXMLHttpRequest.cpp
(gdb) bt
#0  0xb5b14089 in nsXMLHttpRequest::StreamReaderFunc (in=0xafc6d468,
     closure=0xafd49100,
     fromRawSegment=0x871109c "<?xml version=\"1.0\" 
encoding=\"utf-8\"?><response><uid>00f3ab24-0001-0000-0000-", '0' 
<repeats 12 times>, "</uid><tid>851430</tid><suggestions>Sudbury, 
Suffolk|Sudbury, Suffolk.</suggestions><complete>true</complete></"..., 
toOffset=0, count=233, writeCount=0xbfd16494)
     at nsXMLHttpRequest.cpp:1177
#1  0xb7eca457 in nsInputStreamTee::WriteSegmentFun (in=0xafc6d468,
     closure=0xafc75540,
     fromSegment=0x871109c "<?xml version=\"1.0\" 
encoding=\"utf-8\"?><response><uid>00f3ab24-0001-0000-0000-", '0' 
<repeats 12 times>, "</uid><tid>851430</tid><suggestions>Sudbury, 
Suffolk|Sudbury, Suffolk.</suggestions><complete>true</complete></"..., 
offset=0, count=233, writeCount=0xbfd16494)
     at nsInputStreamTee.cpp:102
#2  0xb7ecee86 in nsPipeInputStream::ReadSegments (this=0xafc6d468,
     writer=0xb7eca420 
<nsInputStreamTee::WriteSegmentFun(nsIInputStream*, void*, char const*, 
unsigned int, unsigned int, unsigned int*)>, closure=0xafc75540,
     count=233, readCount=0xbfd16500) at nsPipe3.cpp:763
#3  0xb7eca535 in nsInputStreamTee::ReadSegments (this=0xafc75540,
     writer=0xb5b13fb0 
<nsXMLHttpRequest::StreamReaderFunc(nsIInputStream*, void*, char const*, 
unsigned int, unsigned int, unsigned int*)>,
     closure=0xafd49100, count=233, bytesRead=0xbfd16500)
     at nsInputStreamTee.cpp:156
#4  0xb5b0f495 in nsXMLHttpRequest::OnDataAvailable (this=0xafd49100,
     request=0xafc672fc, ctxt=0x0, inStr=0xafc911b0, sourceOffset=3, 
count=233)
     at nsXMLHttpRequest.cpp:1207
#5  0xb71f0fbd in nsStreamListenerTee::OnDataAvailable (this=0xafc6e278,
     request=0xafc672fc, context=0x0, input=0xafc6d468, offset=3, count=233)
     at nsStreamListenerTee.cpp:97
#6  0xb725037f in nsHttpChannel::OnDataAvailable (this=0xafc672d0,
     request=0xafc6d5a8, ctxt=0x0, input=0xafc6d468, offset=3, count=233)
     at nsHttpChannel.cpp:4213
#7  0xb71d5081 in nsInputStreamPump::OnStateTransfer (this=0xafc6d5a8)
     at nsInputStreamPump.cpp:494
#8  0xb71d51cf in nsInputStreamPump::OnInputStreamReady (this=0xafc6d5a8,
     stream=0xafc6d468) at nsInputStreamPump.cpp:397
#9  0xb7ecffb2 in nsInputStreamReadyEvent::EventHandler (plevent=0xafc76afc)
     at nsStreamUtils.cpp:120
#10 0xb7eec9e7 in PL_HandleEvent (self=0xafc76afc) at plevent.c:688
#11 0xb7eeccfb in PL_ProcessPendingEvents (self=0x80cfe68) at plevent.c:623
#12 0xb7eeebfe in nsEventQueueImpl::ProcessPendingEvents (this=0x80cfe20)
     at nsEventQueue.cpp:417
#13 0xb687f4f5 in event_processor_callback (source=0x81b9578,
     condition=G_IO_IN, data=0x0) at nsAppShell.cpp:67
#14 0xb7639c8d in g_io_channel_unix_get_fd () from /usr/lib/libglib-2.0.so.0
#15 0xb7610802 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0xb76137df in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#17 0xb7613b89 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#18 0xb7bf9574 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#19 0xb687f952 in nsAppShell::Run (this=0x814b3f0) at nsAppShell.cpp:139
#20 0xb6779c12 in nsAppStartup::Run (this=0x814d8a0) at nsAppStartup.cpp:151
#21 0x0804f85c in XRE_main (argc=3, argv=0xbfd16d04, aAppData=0x805ab80)
     at nsAppRunner.cpp:2438
#22 0x0804ab4f in main (argc=1, argv=0x0) at nsBrowserApp.cpp:61
#23 0xb77768cc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#24 0x0804aa81 in _start ()
(gdb) q
The program is running.  Exit anyway? (y or n)