BlackX is a theme for Firefox. It has black and white icons. It has been greatly improved from earlier versions of BlackX. This theme was created by Andrew Shay (xXSonyBoy4lfeXx). BlackX can be downloaded from Mozilla's secure website by clicking the download links on the left. The latest version is highly recommended.

To install you can go to BlackX addons page and that will install it automatically or you can click one of the links to left and if it doesn't auto install you can download it to your desktop, then go into Firefox and click Tools, Addons, then drag the downloaded file into the addons box.