Firefox is a favorite browser among geeks for many different reasons including the enormous amount customizations you can do with it. We have put together a collection of cool black colored themes you can easily add to create the custom look you want. Click on the link below the picture to install the theme. Welcome to the darkness!
If you want to change your theme back to the default go to Tools \ Addons the Themes tab, choose the Default, and restart Firefox.
Also make sure to check out our collection of Awesome Abstract Art Wallpapers.