Here's another extension that was recently released for Microsoft Edge.  It's from Amazon and is supposed to be an 'Assistant to help you with sales, finding things and status on your orders.

But it looks like it's mostly a way for Amazon to get visibility on your browser so they can market to you. So besides getting sales notifications or order status through your email, here's a way that they can reach out and touch you.

If you like that sort of thing.