Used Hide Caption by Ji Shiping, to hide the title bar. Cons: have to aim below the window control buttons to move the window; need a Mozilla Add-ons account to download.
Fission by Zeniko, adds a progress bar to the location bar so you can hide the status bar. Cons: no room for extensions’ status bar icons or download status.
Compact Menu 2 by Milly C., to reduce the menu bar to a blue button next to the location bar. Cons: an additional click for menu only actions.