I've had this happen in the past.  I comes from having a little unity 
pollution on your system causing unity's global menu system to snag the 
menu bars off of GTK based apps but with nowhere to display them, they 
are just missing.

If I remember right, removing these packages will restore your menus:
unity-gtk-module-common
unity-gtk2-module
unity-gtk3-module

Brian Cluff

On 12/22/2013 01:29 AM, der.hans wrote:
> moin moin,
>
> menu items are no longer working for me with Firefox. This includes in
> page items as well as file, dit, view, etc. and also add-ons with buttons
> at the bottom and top. Everything. Browsing still works as long as I don't
> need a menu.
>
> Trying html drop downs results in the following error:
>
> (iceweasel:9467): Gdk-CRITICAL **: IA__gdk_window_peek_children: assertion
> `GDK_IS_WINDOW (window)' failed
>
> iceweasel on debian stable with KDE.
>
> Tried safe-mode and still didn't work.
>
> ciao,
>
> der.hans
>
>
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