FlexBar

With FlexBar, easily show, hide or autohide menu bar, navigation bar, status bar and all others. FlexBar configures the visibility of all menu bars, sidebars and information bars. For every element you can adjust separately whether it is shown never, always or automatically. The automatic display mechanism can be globally deactivated. Optionally you can display additional small buttons on left side of the Tab Bar. The navigation buttons offer an identical functionality to the buttons in the Navigation Toolbar. This way quick page navigation is possible, even when the Navigation Toolbar is hidden.

Requirements:

Mozilla Firefox 3.0