Note from Mozilla: This add-on has been discontinued. Try FXChrome instead.
Chromifox Basic is a coat of chrome for Firefox.
Collector's Note nice Google Chrome Theme
An extension that allows for the use of dynamic commands in Firefox.
A maintained version can be installed via: https://bitbucket.org/satyr/ubiquity/downloads/tip.xpi
Hides or moves menus and menu items. (Deprecated version, see below.)