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Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

on one computer, I open firefox and the window scrolls the menu bar out of sight

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I can't get anything by pressing ALT, and I can't get anything by pressing F11.

I can't get anything by pressing ALT, and I can't get anything by pressing F11.

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Do you get a Navigation Toolbar or tab bar if you hover the mouse to the top of the Firefox window? If that is the case then right-click in empty space on either bar to leave full screen mode.

Try this if F11 doesn't help: