Hi, I've got exactly the same issue with FF4.0.1 and Adblock Plus
1.3.7... when I desactivate Adblock Plus, the empty (really empty: I
can't see anything in it) menu bar disappears.
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I fixed it yesterday, but I really don't know why it worked...
In the DOM tab of Firebug, I saw a "menubar" entry, and changed the "visible"
value from true to false by double-clicking on it (see file attached).
Immediately the empty menu bar disappeared, and since this moment everything is
OK