With the Firefox Add-on FlexBar you can easily configure 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.
To display the bars which are configured as automatic, move the mouse cursor to the bottom or to the left border of the window, or - in case of the top navigation menu - onto the title bar of the window. Using Windows, you can also quickly show or hide the automatic elements of the top navigation menu by pressing the Alt key.
Optionally you can display additional small buttons on left side of the Tab Bar. The navigation buttons offer an identical funtionality to the buttons in the Navigation Toolbar. This way a quick page navigation is possible, even when the Navigation Toolbar is hidden. Additionally, there are buttons for quick access to the menu bar and the bookmarks toolbar. This way, even without autohide active you can save space by hiding the menu bar and the bookmarks toolbar.
Read more detailed information on the Add-on website. Please do not post bug reports in reviews, use the support email address instead.