I like this extension honestly! Add to favourite features is great, i can add items to my favorites and get notified when the price drops. And in the last update they added copy link button which made it easier to share product links with friends!
Track the price history of products on Alibaba for the past 3 or 6 months, receive price drop alerts, view price history chart, add products to favorites, copy product links, and use shortcuts and search box
The extension also uses Google Analytics for anonymous usage statistics and collects anonymous information through technologies like cookies, web beacons, and unique device identifiers