The World's Gate, Inc, released GProxy in Nov 2007.
GProxy is a Firefox/Thunderbird add-on (tool bar and status bar icon) that helps users to manage and switch proxy settings easily. It supports GPass, FreeGate, UltraSurf, Garden, and other proxy systems, with Chinese and English interface.
Many users consider Firefox a more secure and convenient browser. However, when they used it with FreeGate, UltraSurf, or Garden, they had to change its proxy setting manually, and reverse the setting after use. GProxy aims to solve this problem. GProxy is also integrated into GPass 3.
GPass is available for download as a freeware for personal use from http://gpass1.com/gproxy/gproxy.xpi. To install it in Firefox, just drag-drop the download file to the Firefox window. To install it in Thunderbird, use the Tools > Add-on menu.