firefox-30.0_1,1 crash youtube HTML5 videos

Was wondering if anybody else was encountering Firefox crashing when
attempting to play HTML5 youtube videos? 

The system is: 

  FreeBSD peace 10.0-STABLE FreeBSD 10.0-STABLE #1 r266948: Mon Jun  2
  14:12:35 CDT 2014     root@peace:/usr/obj/usr/src/sys/PEACE  i386

and Firefox is being built from source. Compiling with debug symbols and
getting a backtrace on the core provides:

(gdb) GNU gdb 6.1.1 [FreeBSD]
<snip>
[New Thread 28501080 (LWP 100126/firefox)]
(gdb) bt
#0  0x39144f52 in ff_ac3dsp_init_x86 () from /usr/local/lib/gstreamer-1.0/libgstlibav.so
#1  0x00000000 in ?? ()
(gdb) 

The full output of the gdb session is at:

  http://www.eskimo.com/~joji/firefox-gdb.txt

When starting Firefox, I get the following error:
  (process:99902): GLib-CRITICAL **: void g_slice_set_config(GSliceConfig,
  gint64): assertion `sys_page_size == 0' failed

Don't know if it has anything to do with the crash. Anybody else 
experiencing the same? Any suggestions?
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