Description of problem:
firefox 3 crashes when attempting to download files

Version-Release number of selected component (if applicable):
3.0.4

How reproducible:
frequent

Steps to Reproduce:
Try downloading files using ff. 
  
Actual results:
crash

Expected results:
no crash

Additional info:
possible reference - 
http://bugzilla.gnome.org/show_bug.cgi?id=494542
https://bugzilla.mozilla.org/show_bug.cgi?id=444055


backtrace

         #0  0xffffe410 in __kernel_vsyscall ()
    #1  0x00766181 in raise (sig=11)
       at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:41
    #2  0x06322656 in nsProfileLock::FatalSignalHandler (signo=11)
       at nsProfileLock.cpp:212
    #3  <signal handler called>
    #4  IA__gtk_widget_get_toplevel (widget=0x1) at gtkwidget.c:6314
    #5  0x00347704 in gtk_widget_get_screen_unchecked (widget=0x1)
       at gtkwidget.c:5699
    #6  0x00348130 in IA__gtk_widget_get_screen (widget=0x9250000)
       at gtkwidget.c:5736
    #7  0x002736dd in gtk_rc_reset_widgets (settings=0x80632e0)
       at gtkrc.c:1603
    #8  0x001fa2a1 in reset_styles_idle (user_data=0xedd03788)
       at gtkicontheme.c:600
    #9  0x009ca5e1 in g_idle_dispatch (source=0x8dd86e0, callback=0x1,
       user_data=0xedd03788) at gmain.c:3926
    #10 0x009cc342 in IA__g_main_context_dispatch (context=0x8081f08)
       at gmain.c:2045
    #11 0x009cf31f in g_main_context_iterate (context=0x8081f08, block=0,
       dispatch=1, self=0x8060fa8) at gmain.c:2677
    #12 0x009cf885 in IA__g_main_context_iteration (context=0x8081f08,
       may_block=0) at gmain.c:2736
    #13 0x06d2b665 in nsAppShell::ProcessNextNativeEvent (this=0x81ab5e8,
       mayWait=0) at nsAppShell.cpp:144
    #14 0x06d478dc in nsBaseAppShell::DoProcessNextNativeEvent
       (this=0x81ab5e8, mayWait=0) at nsBaseAppShell.cpp:151
    #15 0x06d47db4 in nsBaseAppShell::OnProcessNextEvent (this=0x81ab5e8,
       thr=0x80a99f0, mayWait=0, recursionDepth=1) at nsBaseAppShell.cpp:278
    #16 0x06e58bb0 in nsThread::ProcessNextEvent (this=0x80a99f0, mayWait=0,
       result=0xffff7e48) at nsThread.cpp:497
    #17 0x06e17407 in NS_ProcessPendingEvents_P (thread=0x80a99f0, timeout=20)
       at nsThreadUtils.cpp:180
    #18 0x06d47b07 in nsBaseAppShell::NativeEventCallback (this=0x81ab5e8)
       at nsBaseAppShell.cpp:121
    #19 0x06d2b8fc in nsAppShell::EventProcessorCallback (source=0x811fc30,
       condition=G_IO_IN, data=0x81ab5e8) at nsAppShell.cpp:69
    #20 0x009f594d in g_io_unix_dispatch (source=0x8122370,
       callback=0x6d2b8c0 <nsAppShell::EventProcessorCallback(_GIOChannel*,
       GIOCondition, void*)>, user_data=0x81ab5e8) at giounix.c:162
    #21 0x009cc342 in IA__g_main_context_dispatch (context=0x8081f08)
       at gmain.c:2045
    #22 0x009cf31f in g_main_context_iterate (context=0x8081f08, block=1,
       dispatch=1, self=0x8060fa8) at gmain.c:2677
    #23 0x009cf6c9 in IA__g_main_loop_run (loop=0x9152f58) at gmain.c:2881
    #24 0x001ac9eb in IA__gtk_dialog_run (dialog=0xf5e040e0)
       at gtkdialog.c:996
    #25 0x06d3dc9f in RunDialog (aDialog=0xf5e040e0)
       at nsAccessibilityHelper.cpp:52
    #26 0x06d372a5 in nsFilePicker::Show (this=0xe8bb4fb8, aReturn=0xffff8234)
       at nsFilePicker.cpp:661
    #27 0x06e69579 in NS_InvokeByIndex_P ()
       at ../dist/include/xpcom/nsCOMPtr.h:713
    #28 0x063543c5 in XPCWrappedNative::CallMethod (ccx=@0xffff8408,
       mode=XPCWrappedNative::CALL_METHOD) at xpcwrappednative.cpp:2393
    #29 0x0635b2ea in XPC_WN_CallMethod (cx=0x81f7250, obj=0x8d09d40, argc=0,
       argv=0xf5e9bd4c, vp=0xffff8538) at xpcwrappednativejsops.cpp:1473
    #30 0x04e2116a in js_Invoke (cx=0x81f7250, argc=0, vp=0xf5e9bd44, flags=0)
       at jsinterp.c:1297
    #31 0x04e14f5d in js_Interpret (cx=0x81f7250) at jsinterp.c:4852
    #32 0x04e2129a in js_Invoke (cx=0x81f7250, argc=5, vp=0xf5e9bcfc, flags=0)
       at jsinterp.c:1313
    #33 0x06350a0c in nsXPCWrappedJSClass::CallMethod (this=0xe8ab4d78,
       wrapper=0xf60b9ec0, methodIndex=4, info=0xf278e670,
       nativeParams=0xffff8b64) at xpcwrappedjsclass.cpp:1523
    #34 0x0634a5f3 in nsXPCWrappedJS::CallMethod (this=0xf60b9ec0,
       methodIndex=4, info=0xf278e670, params=0xffff8b64)
       at xpcwrappedjs.cpp:559
    #35 0x06e6a11b in PrepareAndDispatch (methodIndex=<value optimized out>,
       self=0xe9a676f8, args=0xffff8c1c) at xptcstubs_gcc_x86_unix.cpp:95
    #36 0x06ad4aee in nsExternalAppHandler::PromptForSaveToFile
       (this=0xe9b3b668, aNewFile=0xffff8eac, aDefaultFile=@0xe9b3b6a0,
       aFileExtension=@0xffff8cc0)
       at nsExternalHelperAppService.cpp:1920
    #37 0x06ad80e3 in nsExternalAppHandler::SaveToDisk (this=0xe9b3b668,
       aNewFileLocation=0x0, aRememberThisPreference=0)
       at nsExternalHelperAppService.cpp:2015
    #38 0x06e69579 in NS_InvokeByIndex_P ()
        at ../dist/include/xpcom/nsCOMPtr.h:713
    #39 0x063543c5 in XPCWrappedNative::CallMethod (ccx=@0xffff9194,
       mode=XPCWrappedNative::CALL_METHOD) at xpcwrappednative.cpp:2393
    #40 0x0635b2ea in XPC_WN_CallMethod (cx=0x81f7250, obj=0xebc7f960, argc=2,
       argv=0xf5e9bcec, vp=0xffff92c4) at xpcwrappednativejsops.cpp:1473
    #41 0x04e2116a in js_Invoke (cx=0x81f7250, argc=2, vp=0xf5e9bce4, flags=0)
       at jsinterp.c:1297
    #42 0x04e14f5d in js_Interpret (cx=0x81f7250) at jsinterp.c:4852
    #43 0x04e2129a in js_Invoke (cx=0x81f7250, argc=1, vp=0xf5e9bcd8, flags=0)
       at jsinterp.c:1313
    #44 0x06350a0c in nsXPCWrappedJSClass::CallMethod (this=0x8427c20,
       wrapper=0xf5eedfb0, methodIndex=3, info=0xf4c06ab8,
       nativeParams=0xffff98f0) at xpcwrappedjsclass.cpp:1523
    #45 0x0634a5f3 in nsXPCWrappedJS::CallMethod (this=0xf5eedfb0,
       methodIndex=3, info=0xf4c06ab8, params=0xffff98f0)
       at xpcwrappedjs.cpp:559
    #46 0x06e6a11b in PrepareAndDispatch (methodIndex=<value optimized out>,
       self=0xf29511a8, args=0xffff9994) at xptcstubs_gcc_x86_unix.cpp:95
    #47 0x06e5c669 in nsTimerImpl::Fire (this=0xe62eefb0)
       at nsTimerImpl.cpp:403
    #48 0x06e5c76e in nsTimerEvent::Run (this=0xf1c01200)
       at nsTimerImpl.cpp:490
    #49 0x06e58c0f in nsThread::ProcessNextEvent (this=0x80a99f0, mayWait=1,
       result=0xffff9a54) at nsThread.cpp:510
    #50 0x06e17343 in NS_ProcessNextEvent_P (thread=0x60103, mayWait=1)
       at nsThreadUtils.cpp:227
    #51 0x06d47a67 in nsBaseAppShell::Run (this=0x81ab5e8)
       at nsBaseAppShell.cpp:170
    #52 0x06b4debf in nsAppStartup::Run (this=0x81f6e08)
       at nsAppStartup.cpp:181
    #53 0x0631a231 in XRE_main (argc=1, argv=0xffffd224, aAppData=0x8060980)
       at nsAppRunner.cpp:3170
    #54 0x080490a2 in __gxx_personality_v0 ()
       at libstdc++-v3/libsupc++/eh_personality.cc:349
    #55 0x005fadec in __libc_start_main (
       main=0x8048d50 <__gxx_personality_v0+352>, argc=1, ubp_av=0xffffd224,
       init=0x804f820 <__gxx_personality_v0+27696>,
       fini=0x804f810 <__gxx_personality_v0+27680>,
       rtld_fini=0x5d55d0 <_dl_fini>, stack_end=0xffffd21c)
       at libc-start.c:231
    #56 0x08048c51 in __gxx_personality_v0 ()
       at libstdc++-v3/libsupc++/eh_personality.cc:349