The built-in price notification along with the price tracking history was a good thing to have shopping on various websites. The direct link to the product's webpage on Amazon was also a pleasing idea. +2 stars for that; however, Firefox continuously froze for 15-45 seconds every time I opened a new window. Sometimes (~3/10 times), Firefox would completely freeze, and I'd have to resort to the task manager. The continuous freezing on Firefox was grounds for removal on me end. Until Amazon fixes issues like this, I'll not be using this add-on.