Koffix Blocker is a desktop application that helps you to block or restrict sites that are involved in questionable practices. When you surf the web you may sometimes accidentally visit sites that, for example, try to install some sort of spyware on your computer. If you had known that beforehand you probably wouldn't have visited these sites at all. Koffix Blocker can help you block these sites. To block a site, Koffix can simply add it to the HOSTS file. This type of block will stop all communication with the site and it will appear to you as if the site does not exists. Koffix can also restrict certain sites by adding them to the Restricted Zone, which in short put certain restrictions on the sites such as preventing the site from running ActiveX, JavaScript or installing files. You will still be able to browse the restricted web site. You can find the complete list of sites included in Koffix on the official Koffix website.