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It simply doesn't do anything, other coupon extensions might wait for the checkout page and give outdated codes, but at least it has some feedback. With this one, you don't know if it checked for any codes or not, no messages, no animations, no nothing. A waste of time. 
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It simply doesn't do anything, other coupon extensions might wait for the checkout page and give outdated codes, but at least it has some feedback. With this one, you don't know if it checked for any codes or not, no messages, no animations, no nothing. A waste of time. ️