DontPayFull.com's Amazon Shopping Tools extension is a personal favorite of mine. It's extremely helpful for finding the best Amazon deals and saving money. The extension is simple to install and use. It offers a wide range of options for comparing prices and finding the best deals. I like how it even shows you coupon codes for additional savings. I also like that it is constantly updated with the latest deals and that it is completely free. Overall, it's a fantastic extension for anyone who shops on Amazon and wants to save money. Highly recommended!