I have got same problem like MarcoBazzani, but with firefox3
(firefox:6699): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed ** ** Gtk:ERROR:(/build/buildd/gtk+2.0-2.12.9/gtk/gtkplug.c:182):gtk_plug_set_is_child: assertion failed: (!GTK_WIDGET (plug)->parent) Aborted
I have got same problem like MarcoBazzani, but with firefox3
(firefox:6699): GLib-GObject- CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed (/build/ buildd/ gtk+2.0- 2.12.9/ gtk/gtkplug. c:182): gtk_plug_ set_is_ child: assertion failed: (!GTK_WIDGET (plug)->parent)
**
** Gtk:ERROR:
Aborted