GLib error in www/firefox and www/seamonkey

[Beeblebrox]

Hello.
Latest upgrade for Firefox & Seamonkey result in GLib error.
Compiles and installs without error, but crashes when started.

* ~/.mozila folder was renamed to rule out profile as source of problem.
* Merging gnome3 ports from marcuscom-devel.
* GLib binaries on the system:  dbus-glib-0.100.2 / goffice010-0.10.11 /
goffice08-0.8.17_5 / libgdata-0.14.0 / linux-f10-dbus-glib-0.76
* Options file for Firefox (omitting UNSET entries):
OPTIONS_FILE_SET+=DBUS
OPTIONS_FILE_SET+=GCONF
OPTIONS_FILE_SET+=GIO
OPTIONS_FILE_SET+=GNOMEUI
OPTIONS_FILE_SET+=GSTREAMER
OPTIONS_FILE_SET+=OPTIMIZED_CFLAGS
OPTIONS_FILE_SET+=PULSEAUDIO
* FreeBSD_amd64_11-current_RadeonKMS
Firefox-28.0,1, Makefile 348650 2014-03-19 20:46:37Z beat
Seamonkey-2.25, Makefile 348676 2014-03-20 10:15:01Z beat
$ firefox
(process:2036): GLib-CRITICAL **: void g_slice_set_config(GSliceConfig,
gint64): assertion 'sys_page_size == 0' failed
(firefox:2036): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::sm-connect after class was initialised
(firefox:2036): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::show-crash-dialog after class was initialised
(firefox:2036): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::display after class was initialised
(firefox:2036): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::default-icon after class was initialised
Segmentation fault (core dumped)

$ seamonkey
(process:2038): GLib-CRITICAL **: void g_slice_set_config(GSliceConfig,
gint64): assertion 'sys_page_size == 0' failed
(seamonkey:2038): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::sm-connect after class was initialised
(seamonkey:2038): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::show-crash-dialog after class was initialised
(seamonkey:2038): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::display after class was initialised
(seamonkey:2038): GLib-GObject-WARNING **: Attempt to add property
GnomeProgram::default-icon after class was initialised
Segmentation fault (core dumped)