Personas are open source lightweight “skins” that change the look of your Firefox web browser. Unlike Firefox themes these Personas only changes the header and footer of the browser without any change to the look of the navigation buttons or menus. 
With just few click you can add or change your current Persona. You can not only choose from hundreds of Personas available but also create you own Persona and share it with others. Just create and upload two graphics files not exceeding 300KB in your favorite graphics editing application (e.g., Photoshop) for the header or the footer image and use it straight away.
To add Personas to your Firefox go to getpersonas.com and click on the ‘Get Personas for firefox- free’ download button which installs this wonderful add-on to your browser. After installation you will have to restart firefox to choose and change your Persona. It can be done anytime simply by clicking on the little fox mask in the lower left-hand corner of your browser window.
Watch this quick demonstration video