A web proxy provides an easy way to change your IP address while surfing the Internet. They don’t require software or modification to your networking settings. You just enter a website address and the sites you visit through the proxy see an IP address belonging to the proxy rather than your IP address.
I am very cautious about using web proxies as you never know who actually operates it and what data they might collect as you use it. You also don’t know to whom they might give that data. On the other hand, I have found one that has a useful feature.
nroxy offers all the usual web proxy features plus something interesting–it offers the ability to change the user agent. For example, some web sites cannot be viewed properly using Firefox. Sometimes it is an old site that requires MS Internet Explorer (IE) or it may be a site designed for mobile devices. This proxy offers user agents typical of 5 mobile devices and a long list of browsers.
To get the information I need I am finding it necessary to switch user agents more often. Usually, I use the User Agent Switcher extension that adds a menu and a toolbar button to switch the user agent of a browser. It allows you to chose from three versions of IE or an iPhone. Selecting the iPhone user agent often reveals additional functionality on the site. The extension is available for Firefox and will run on any platform that this browser supports including Windows, OS X and Linux.
Now I have another option when I need to change the user agent and I get the additional proxy features as well.