firefox keeps crushing

Firefox 3 on hardy keeps crushing when i visit a particular site www.howtoforge.com, prior to the upgrade it worked fine. here is a dump or the error produced.

andrew@dexter:~$ firefox --sync
The program 'firefox' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAlloc (insufficient resources for operation)'.
  (Details: serial 84675 error_code 11 request_code 53 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb64f4767]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb64f481e]
#2 /usr/lib/libX11.so.6 [0xb6a8a5f8]
#3 /usr/lib/libX11.so.6(XFreeCursor+0x25) [0xb6a669d5]
#4 /usr/lib/libqt-mt.so.3(_ZN11QCursorDataD1Ev+0x3f) [0xb54d0375]
#5 /usr/lib/libqt-mt.so.3(_ZN7QCursorD1Ev+0x5a) [0xb54d057a]
#6 /usr/lib/libqt-mt.so.3 [0xb54d05c1]
#7 /lib/tls/i686/cmov/libc.so.6(exit+0xd4) [0xb7c77f34]
#8 /usr/lib/libgdk-x11-2.0.so.0 [0xb666c637]
#9 /usr/lib/libX11.so.6(_XError+0xfe) [0xb6a8381e]
#10 /usr/lib/libX11.so.6 [0xb6a8af3c]
#11 /usr/lib/libX11.so.6(_XReply+0x15a) [0xb6a8b2fa]
#12 /usr/lib/libX11.so.6(XSync+0x6a) [0xb6a7f32a]
#13 /usr/lib/libX11.so.6 [0xb6a7f4a5]
#14 /usr/lib/libX11.so.6 [0xb6a8b65d]
#15 /usr/lib/libX11.so.6(XCreatePixmap+0x8d) [0xb6a61f0d]
#16 /usr/lib/libgdk-x11-2.0.so.0(gdk_pixmap_new+0x13c) [0xb666d9dc]
#17 /usr/lib/xulrunner-1.9b3/libxul.so(_ZN14gfxPlatformGtk22CreateOffscreenSurfaceERK10gfxIntSizeN11gfxASurface14gfxImageFormatE+0xd1) [0xb78c7029]
#18 /usr/lib/xulrunner-1.9b3/libxul.so(_ZN11gfxPlatform13OptimizeImageEP15gfxImageSurfaceN11gfxASurface14gfxImageFormatE+0x2a) [0xb78c3b5c]
#19 /usr/lib/xulrunner-1.9b3/libxul.so [0xb77da184]
firefox: xcb_xlib.c:73: xcb_xlib_lock: Assertion `!c->xlib.lock' failed.
Aborted (core dumped)