This might be the single greatest add-on ever in existence. You literally do nothing and it saves you money when it sense you are checking out and it gives you points every time you use the coupons and you get cash back. What?! Is this real life? <3 And you don't get bombarded with notifications or emails or anything. You forget it exists until you online shop. Everyone should use this.
It probably applies to 30-40% of my online purchases and when it does I have saved up to $25, or as little as $0.40. But still. So happy. I see other people have had problems with it slowing down the browser but I have had no such issues thankfully. :)