Moves the tabs to the very top of the Firefox window.
Compatibility 
Works with: Firefox 4.0+
Background
By default the Firefox button is fixed in the upper left corner of the browser window and can not be moved.
Tabs are below the Firefox Button and Windows control by default on a non-maximized browser window leaving a large area of ‘dead space’. Firefox 6 Aurora build (6.0a2).
The Tweak
The Moveable Firefox Button add-on, changes the Firefox Button into an icon and is moved down to the tab bar where it can be moved via the Customize… feature. Also allows the Firefox button to be displayed in Full Screen mode with the Full Screen Mode Tweaks.
Upon restart after installing the add-on the Firefox button is now an icon and has been moved down to the tab bar.
Notes
Windows Users can gain even more screen space by using this in combination with the Tabs on Very Top tweak. See the Notes section on that article for more information.
Updated: November 15, 2025
