This add-on adds 2 menu items under the Firefox button (Firefox 4 only) and the File menu. They allow you to restart your browser, or quit, while keeping the currently open tabs.
There are also 3 buttons available for the toolbar, "Restart", "Exit", and a button which combines both.
Finally, 2 buttons that sit in the titlebar next to the minimize/maximize/close buttons (Firefox 4 only).
Now the add-on has preferences so you can turn features on/off and keep your Firefox clean.
The add-on now supports these locales: de, en, es, fr, ja, pt-BR, pt-PT, ru.