My Ubuntu's Firefox browser's sub menus disappears after the screen saver is active. When I click on a menu topic like 'File' the sub menu appears, but when I move the mouse to select a menu item, the sub menu disappears. I tried to disable the display hardware acceleration property, but it did not help.
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closed as too localized by Bruno Pereira♦ Mar 6 '12 at 8:05
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I don't know why this happens (it happens to me too), but if you minimize Firefox and then maximize it again, the problem will go away.