Price Comparison for Firefox (Superfish Window Shopper For Firefox) is a free browser add-on that instantly compares prices and shows similar items on any product in U.S online stores including Amazon.com, Best Buy, Macys, Nordstorm, Overstock.com, Staples, Target, and Wal-mart. After you download and install Window Shopper, you will see a "See Similar" icon appear next to product images on shopping websites. Just click on the icon and the Window Shopper window will appear, presenting deals and visually similar products from hundreds of online stores. With the Window Shopper Add-on, there's no more jumping around from site to site to compare prices or to find what you want. You can also save or share an item or refine your search by style, color, or price.