This add-on launches many requests without any user interaction if it detects a coupon code section on a page. Sometimes it'll roll through as many as 20 different codes, applying each of them to determine the amount saved. Often times this automatic runaway process straight up breaks sites or shopping carts by triggering rate limiters or overriding manually-selected discounts/affinities. The settings are - I believe - somehow managed through the capitaloneshopping web site, but it is not at all clear what settings will change what behavior in the add-on. If the Capital One name were not tied to this add-on then I would instantly disregard it as malicious. The links section here all point to generic web pages that are not at all related to the add-on which frankly behaves like it's compromised.