For such a praised addon, I have to say this is the most annoying and useless addon I have ever had the displeasure of using. It rarely works on the sites I'd like it to work on, and even when it does it constantly pops up telling me it can save me money only for every single discount code to fail.

Probably just an addon used to track analytics of online shoppers. Nothing more. Might save you a couple bucks somewhere down the road, but not enough to be worth the headache.