This is reliably reproducible for me in version 2.0.0.1+dfsg-1, starting with a fresh profile and no other packages that install files in /usr/lib/iceweasel.
Opening the customisation window or dragging something and dropping it where it started isn't enough to trigger this. You have to make some kind of real change, e.g. add a separator to the navigation bar. After this the menu headings are greyed out; mousing over makes them black but they can't be pulled down. Ben. -- Ben Hutchings For every complex problem there is a solution that is simple, neat, and wrong.
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