The addon provides a button for easily closing all open tabs.
The new version 2.3 is now fully compatible with Firefox 24.
Also provides several configuration options:
1) Whether the browser's home page(s) should be loaded.
2) Whether the current tab should remain open.
3) Whether the warning about closing multiple tabs should be suppressed. (This also works with "Tab Mix Plus".)
4) Whether to show notifications about the button location and configuration.
5) Selection of button location.
6) Option for smaller button.
The button is automatically added to the tabs toolbar. You can change the button's position via "Customize..." in the context menu.
The addon is a revised version of "Close All Tabs 1.1".