As long as I don't start getting extra SPAM or something because of the install, I'd say it's a great add-on so far (but not sure if I might deactivate or even un-install when not shopping). Alternatively, possibly have one Browser that you only use for shopping and isolate all other info from that until you feel safe...

Anyway, not a huge savings today, but only had a 15% coupon code and just missed a 20% that expired, but CouponBirds found me another 20% that worked and I didn't have to scour the internet to find it!