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 (after restarting Firefox or rebooting my machine) though this value has
come back to "true", obviously... I can't explain.
** Attachment added: "FirebugDOM.png"
https://bugs.launchpad.net/globalmenu-extension/+bug/777619/+attachment/2133589/+files/FirebugDOM.png
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https://bugs.launchpad.net/bugs/777619
Title:
Unused empty menu bar
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