This just sets up the browser to use a proxy,50.116.59.63 port 80, for those websites.
As it says in the privacy policy, they are only proxy service providers. The add-ons are supposed to do just that, use their proxy.
Unless they constantly change their proxy's IP and play cat and mouse with the targeted websites. That is possible without user intervention because they use a self-hosted file (http://mediahint.com/default.pac) to setup the proxy through the use of their extension.