Does just what it claims. Rated 5 out of 5 stars

I've never understood why the teensy menu bar should not share real estate with the title bar. I searched, and found this add-on. If you already have your menu bar shown (by default it's off, I think), then you'll need to hide the menu bar for this add-on to show its own menus: view->menus->menu bar. This add-on replaces the title in the titlebar with the menus, but the title can be added back: right-click, customize, drag "Titlebar Text" to toolbar, and restart firefox so that the text will update when changing tabs. I also added the address field and the search field up there too! :D As others have noted, for versions of FF below the very latest, you will need use earlier versions, eg FF22 requires version 1.0.20121204 from:

This review is for a previous version of the add-on (1.0.20130518.1-signed.1-signed).