UltraSurf Mozilla Firefox add-on

UltraSurf is a popular, free proxy software that enables users to surf the internet anonymously. This is useful in countries with heavy Internet censorship to visit any public web sites. Users in countries without internet censorship can also use it to protect their internet privacy and security.
But, one of the disadvantages of UltraSurf is that, when browsing with Firefox browser it does not change your IP address automatically, instead you need to change the settings manually. Now it is possible with this Firefox add-on.
How to use it?

First of all download (442Kb) and install UltraSurf software from here (No installation required, just double click the exe file when needed). Then download (23Kb) Ultrasurf Firefox add-on and unzip it.
Open Firefox browser and drag the wjbutton_en.xpi file to Firefox window. Click the "Install" button to install it.
The UltraSurf icon / text will show at the right-bottom of the Firefox window. Close all Firefox windows and re-open Firefox.

A grey-out UltraSurf icon (red text) means UltraSurf is disabled. Click it to enable or disable it
To uninstall the add-on, go to tools - add-ons of Firefox and uninstall it.