Personas are light weight, easy to install, and easy to change skins for your Firefox web browser.  It is installed as a Firefox Addon. Once installed, you can access it from the Firefox menu – Tools > "Personas for Firefox". Personas allow you to  transform the look of your Firefox web browser with just a few clicks.

If you have not installed Firefox Personas yet, install it and give it a try. Check out the following screenshots of my web browser dressed in Firefox Personas.

A small sample of Firefox Personas skins in action.

Personas Addon Options in Firefox

Firefox Personas enabled view of the web browser

Personas should not be mistaken for Firefox themes. Personas skin only the header and footer of the web browser leaving the rest alone. Where as,  Firefox themes change the appearance of navigation buttons, toolbars and menus as well. Personas are light weight and make use of  very little system resources, while Firefox themes are more resource hungry.