Oh boy, are you going to have a bunch of FUN! This is real easy: Go to www.mozilla.com/ the Home page where you initially found your download to install Firefox and seek out the clickable to"Customize". Scroll along the page that will open until you see "Themes" and click again to view the 300 different Themes that are presently available to dress up your very own Fox. Lots of cool ideas available and more are created everyday. Come back often to find new Themes for the seasonal changes or should you ever wish to try out another flavor. Kind of like painting your room over or trying on new clothing. All are FREE.