You can use this method to hide your IP address while browsing is public forums for some privacy reasons ..
what is SSH Tunneling ?
A shell account ( not necessarily a root account )
and type your host name and the ssh port ( by default it will be 22)
Click on ssh > Tunnels
and enter a source port (something above thousand will do )
lets use 1337 and then click on Dynamic for Destination
and click add..
and then you can go back to Session and you can save that settings with the desired name so that you can skip these things for the next time
and click open ..and then you have to login with the credentials what you have ( root or any shell acc will do )
and then minimise the putty window..
next we will open the firefox settings tab and fill the details as shown in the below image
select the port what you have used as source port in the putty window (we had used 1337 )..
and save the settings..
you are done..
then make sure that its working by visiting any site which shows the ip, and other details ..
on of the sites is ipmango.com