There probably isn't an easier way to change the look of Firefox than with this little freeware add-on. Personas installs just as easily and quickly as any other Firefox extension. When it starts for the first time, a Web page opens giving instructions in three steps. That's all you'll need to understand how this program works.
Instead of access through a File menu or right-click, you'll find a tiny fox icon in the lower left of the browser window. Just click to find four options: New, Most Popular, Recent, or All. Navigate to any of these to find options aplenty to skin Firefox. You won't even need to restart the browser for the new look to take effect.
Change your Firefox theme as often as you like with this simple, effective freeware. Personas is recommended for any Firefox aficionado.