Unless there is a plan to upgrade the port to 2.24.23 really soon (see bug #191177), then I propose to add the following patch to the port: https://mail.gnome.org/archives/commits-list/2013-December/msg00175.html to fix the following bug: https://bugzilla.gnome.org/show_bug.cgi?id=705367 To me the leak manifested itself as such: http://thread.gmane.org/gmane.os.freebsd.devel.gecko/3870
Gtk20 was updated to 2.24.25 fixes this issue.