userstyles.org - Autohide Menubar

This style automatically hides the menu toolbar until you mouse over where it should be, i.e. above the navigation toolbar. When you mouse over, it reappears and rolls the other toolbars down below it. It disappears again when you move the mouse away.

This is great for saving vertical screen space and avoiding extensions which merely compact the menu toolbar into a single menu button.

Inspired by the Hide Menubar extension ([*]) which hides the menu until you press the Alt key, and NettiCat who submitted code for a mouse-based version rather than keyboard.

Compatible with Firefox 2 and 3.

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Tip: Add toolbar buttons to the menubar that you don't wish to clog up your regular toolbar. This way they are still there when you need them but out of the way when you don't. You may need to temporarily disable the style in order to drag buttons to the menubar.

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UPDATE:

Now hides the ugly 1 pixel solid line