Buy a lot of Kindle books on Amazon.co.jp and your order history fills up with them, burying the physical orders you actually need to track. Hide Kindle Orders is a Firefox extension that hides the order cards marked Kindle on the order history page. Flip the toolbar button to hide or show them: there is no settings screen. It only touches the order history page, and the hiding happens inside your browser with nothing sent anywhere. Updated automatically. Free and open source.