Invisible Hand Add-on for FireFox

FireFox  is the web browser I use instead of Internet Explorer. It is safer and more versatile. There are countless add-ons for this browser. Invisible Hand is a good one.

Invisible Hand Add-on always gets you the lowest price. Invisible Hand shows a discreet notification when the product you're browsing can be bought for a lower price elsewhere. It gives you a link directly to the product page at the competing retailer.