Comment 2 for bug 524840

Here is the stack at the moment of crash
#0 0x00007ffff39f6fff in ?? () from /usr/lib/libcairo.so.2
#1 0x00007ffff39f0eb9 in cairo_clip_extents () from /usr/lib/libcairo.so.2
#2 0x00007ffff551cd6c in gfxContext::GetClipExtents() () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#3 0x00007ffff5458c77 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#4 0x00007ffff4e90ced in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#5 0x00007ffff4e91373 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#6 0x00007ffff4e7bdce in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#7 0x00007ffff4e7bf54 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#8 0x00007ffff4ecec51 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#9 0x00007ffff4e832e8 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#10 0x00007ffff4e9c6b4 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#11 0x00007ffff50079c3 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#12 0x00007ffff54fb7e5 in NS_InvokeByIndex_P () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#13 0x00007ffff4d378f1 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#14 0x00007ffff4d3f36b in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#15 0x00007ffff638f1e3 in js_Invoke () from /usr/lib/xulrunner-1.9.1.8/libmozjs.so
#16 0x00007ffff638041c in ?? () from /usr/lib/xulrunner-1.9.1.8/libmozjs.so
#17 0x00007ffff638f1ed in js_Invoke () from /usr/lib/xulrunner-1.9.1.8/libmozjs.so
#18 0x00007ffff4d33f44 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#19 0x00007ffff54fc3c5 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#20 0x00007ffff54fb887 in ?? () from /usr/lib/xulrunner-1.9.1.8/libxul.so
#21 0x00007fffdf05dfc0 in ?? ()
#22 0x00007fffdb1ccf60 in ?? ()
#23 0x00007fffdf05dfc0 in ?? ()
#24 0x00007fffdb1ccf60 in ?? ()
#25 0x00007fffe36bce70 in ?? ()
#26 0x0000000000000002 in ?? ()
#27 0x4000000000000000 in ?? ()
#28 0x4000000000000000 in ?? ()
#29 0x0000000000000000 in ?? ()
==========

BTW, why am I getting this:
Reading symbols from /usr/lib/firefox-3.5.8/firefox...(no debugging symbols found)...done.
while I have firefox-3.5-dbg installed. It looks like the debug package lacks of debug information...