I wonder how we all have browsed the web a few years ago without Firefox? I can't imagine one minute in the net without Firefox. It is one of the most useful invention in the last 100 years.
Firefox has made online job easier and quicker with their innovative 'addons' and 'plugins'.
Here is an excellent plugin that can also save us money shopping online.
How it works?
This Firefox extension called InvisibleHand notifies when a product that we are brwosing and intended to buy is available cheaper else where by searching similar sites.