menu export dont work is broken

if you start firefox in kubuntu and have enabled the kwin menubutton or the plasma globalmenü - the menü in firefox is broken and not usable at all.
you need to disable the menuexport via firefox option ui.use_unity_menubar;false

when you start firefox via terminal, you will get this:
(process:26790): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed

(firefox:26790): LIBDBUSMENU-GTK-CRITICAL **: dbusmenu_menuitem_property_set_shortcut: assertion 'gtk_accelerator_valid(key, modifier)' failed

other gtk apps cant export the menu. apps like gimp and inkscape just use the integrated menu

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libdbusmenu-gtk4 12.10.3+14.04.20131125-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-2.17-generic 3.13.0-rc7
Uname: Linux 3.13.0-2-generic x86_64
ApportVersion: 2.13.1-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Jan 12 19:40:50 2014
InstallationDate: Installed on 2013-12-12 (31 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: libdbusmenu
UpgradeStatus: No upgrade log present (probably fresh install)