Extension doesn't add anything; just use the website and avoid the extra tracking and spam. If they were more careful about claiming which sites they could automatically try codes for, I'd be a little less critical, but they claim they can automatically try codes for every single site they know about, when they absolutely cannot for a majority of eCommerce sites.

Breaks some websites and I'm unable to disable it for individual websites. Also, tons of outdated coupons but worth having around to save an extra $20 here and there.