Estou recebendo esses avisos durante o lançamento do firefox em um terminal:
(process:4049): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
(firefox:4049): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::sm-connect after class was initialised
(firefox:4049): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::show-crash-dialog after class was initialised
(firefox:4049): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::display after class was initialised
(firefox:4049): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::default-icon after class was initialised