Bug#607962: Confirmed here also

[Eric Valette]

It breaks both icedove (replyall, cut part of the message) and iceweasel 
(each time a flash is going to be played)

Program received signal SIGSEGV, Segmentation fault.
0x00007f63155f7b69 in gdk_property_change () from 
/usr/lib/libgdk-x11-2.0.so.0
(gdb) bt
#0  0x00007f63155f7b69 in gdk_property_change () from 
/usr/lib/libgdk-x11-2.0.so.0
#1  0x00007f6315a15bed in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#2  0x00007f63159a6b03 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#3  0x00007f63163b133e in g_closure_invoke () from 
/usr/lib/libgobject-2.0.so.0
#4  0x00007f63163c9ff2 in ?? () from /usr/lib/libgobject-2.0.so.0
#5  0x00007f63163cb97c in g_signal_emit_valist () from 
/usr/lib/libgobject-2.0.so.0
#6  0x00007f63163cc363 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#7  0x00007f6315ad8b9f in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#8  0x00007f631599ebf5 in gtk_main_do_event () from 
/usr/lib/libgtk-x11-2.0.so.0
#9  0x00007f63155ece7c in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#10 0x00007f6315efb282 in g_main_context_dispatch () from 
/lib/libglib-2.0.so.0
#11 0x00007f6315eff948 in ?? () from /lib/libglib-2.0.so.0
#12 0x00007f6315effafc in g_main_context_iteration () from 
/lib/libglib-2.0.so.0
#13 0x00007f6305ee099d in nsBaseAppShell::DoProcessNextNativeEvent 
(this=0x7f630930a460, mayWait=<value optimized out>) at 
nsBaseAppShell.cpp:155
#14 0x00007f6305ee0a95 in nsBaseAppShell::OnProcessNextEvent 
(this=0x7f630930a460, thr=0x7f63103ca7d0, mayWait=1,
     recursionDepth=<value optimized out>) at nsBaseAppShell.cpp:311
#15 0x00007f63176d1382 in nsThread::ProcessNextEvent 
(this=0x7f63103ca7d0, mayWait=1, result=0x7fff4a1f735c) at nsThread.cpp:508
#16 0x00007f63176a6027 in NS_ProcessNextEvent_P (thread=<value optimized 
out>, mayWait=<value optimized out>) at nsThreadUtils.cpp:250
#17 0x00007f6305ee07d9 in nsBaseAppShell::Run (this=0x7f630930a460) at 
nsBaseAppShell.cpp:177
#18 0x00007f63045d79da in nsAppStartup::Run (this=0x7f6304802940) at 
nsAppStartup.cpp:183
#19 0x00007f6317940e41 in XRE_main (argc=<value optimized out>, 
argv=<value optimized out>, aAppData=<value optimized out>) at 
nsAppRunner.cpp:3493
#20 0x000000000040184b in main (argc=1, argv=0x7fff4a1f7d48) at 
nsMailApp.cpp:101

-- eric