download tor software from this link

Code:

http://www.torproject.org/download.html.en

then
install it.

now


now download tor plugin for ur firefox


Code:

https://addons.mozilla.org/en-us/firefox/addon/2275

as soon as you apply that plugin , it will ask you to restart firefox, do it..

now u can see tor disabled or tor enabled text on right - bottom side of ur firefox browser.

click on it if it is stating that tor disabled , ur click will make it enable.
visit any ip showing sites. and check ur ip address.

its all done.