Certain sites are available only in mainland China, so Unblock Youku for Firefox was created to enable travelers and others outside of China to access them. The terms of the user agreement require that you only use the add-on for academic purposes, and its creators take no responsibility for other uses or consequences. The add-on provides immediate access to videos on sites such as Youku and Tudou, but it does not support all sites that are only accessible in mainland China.
There are a few important things that those attempting to use the add-on should keep in mind. The proxy settings altered by the program may create a problem with your network environment depending on its preexisting proxy requirements. Sites for which P2P plugins need to be installed do not work with this add-on, so users will not be able to access Sina Live Video, CNTV, or other sites that have this requirement.
