Why should you need this? BEcause some websitesrestrict use to some countries, so you can decide to access them using a proxy of another country.
IT's very easy to use. You only have to enter the URL you want to visit and click the new button appearing next to the address bar. You'll see a new tab and the website on it.
1-Click Web Proxy is very useful to access restricted contents as well as to check how people from other countries view your website.