This tweak works with Mozilla/Firefox
Download Modify header 0.6.6 addon for Mozilla (It is Compatible with Mozilla 3.6 and delow)
or modify header 0.7.0 (compatible with mozilla 4.0 and above)
** How to download modify header **
On the menu bar of mozilla, click on option > Addons > Extensions
by the top right, type 'Modify header' in the search all addons box, click search
install the addons and restart the mozilla browser
** Modify Header Settings **
On the menu bar of mozilla, click on option > Addons > Modify Header > option
on the left side of the modify header interface, select Add
under name put 'Host', under value put '10.199.212.8' , click save (it's by the right)
on the bottom right of the interface, click enable all
then close the modify header
** Browser Setting **
Mozilla
On the Menu Bar, Click Option > Advanced > Network
Under Connection, Click Settings
Then select Manual proxy settings
Http proxy: 10.199.212.2
port: 8080
** You are good to browse free **