Scam for sure. Depending on your luck that day, you may or may not receive your cash back. And the invasive toolbar is definitely a way in which the company shopathome.com makes money. The coupons are not as good as RetailMeNot, and the cash back is not as high as Ebates or FatWallet, or even BeFrugal.
They also host "seasonal" pages and campaigns that feature coupons completely irrelevant to the "seasonal" campaign. For instance, right now there is a Horchow flatware coupon for their Halloween promotion...
Hello Rafaella, The ShopAHome.com Savings App is a tool designed to enhance your shopping experience and save you money when shopping online! It is great for finding coupon codes and earning cashback on your purchases but we do understand that it's not for everyone. We appreciate your feedback regarding our seasonal pages and look forward to seeing you shop with us in the future. If you have any more questions or concerns please don't hesitate to ask, we're always here to help!