Firefox 26 outputs an error at startup:
which is a mozilla bug reported here: https://bugzilla.mozilla.org/show_bug.cgi?id=672671 which is not yet fixed.
Just a pointer to ports maintainer.
(process:2214): GLib-CRITICAL **: void g_slice_set_config(GSliceConfig, gint64): assertion `sys_page_size == 0' failed
which is a mozilla bug reported here: https://bugzilla.mozilla.org/show_bug.cgi?id=672671 which is not yet fixed.
Just a pointer to ports maintainer.