(gecko:11471): Gtk-WARNING **: Can't set a parent on widget which has a parent
(gecko:11471): Gtk-CRITICAL **: gtk_widget_destroy: assertion `GTK_IS_WIDGET (widget)' failed
(gecko:11471): Gtk-CRITICAL **: gtk_widget_destroy: assertion `GTK_IS_WIDGET (widget)' failed
(gecko:20570): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to `GtkWidget'
(gecko:20570): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to `GObject'
(gecko:20570): GLib-GObject-CRITICAL **: g_object_get_data: assertion `G_IS_OBJECT (object)' failed

kbuildsycoca: WARNING: '/usr/share/applications/mozilla-firefox.desktop' specifies undefined mimetype/servicetype 'application/rss+xml'
kbuildsycoca: WARNING: '/usr/share/applications/mozilla-firefox.desktop' specifies undefined mimetype/servicetype 'application/rdf+xml'
kbuildsycoca: WARNING: '/usr/share/applications/mozilla-firefox.desktop' specifies undefined mimetype/servicetype 'x-directory/webdav'
kbuildsycoca: WARNING: '/usr/share/applications/mozilla-firefox.desktop' specifies undefined mimetype/servicetype 'x-directory/webdav-prefer-directory'
The program 'firefox-bin' received an X Window System error.
/usr/lib/firefox/run-mozilla.sh: line 131:  3214 Killed                  "$prog" ${1+"$@"}
/usr/lib/firefox/run-mozilla.sh: line 131:  7591 Killed                  "$prog" ${1+"$@"}
/usr/bin/firefox: line 183:  8426 Killed                  "$dist_bin/run-mozilla.sh" $script_args "$dist_bin/$MOZILLA_BIN" "$@"
/usr/lib/firefox/run-mozilla.sh: line 131: 15530 Killed                  "$prog" ${1+"$@"}
/usr/lib/firefox/run-mozilla.sh: line 131: 16465 Killed                  "$prog" ${1+"$@"}