Reminds users to check their Amazon shipping address before purchasing. Useful for parents, the elderly, or the generally forgetful.

AmazonShippingAddressWarning.user.js

// ==UserScript==
// @name         Amazon Shipping Address Warning
// @namespace    http://samg381.com
// @version      1.3
// @description  Remind users to check their Amazon shipping address before purchasing.
// @author       Samg381
// @run-at       document-idle
// @match        https://www.amazon.com/*
// @grant        none
// @require
// @noframes
// @downloadURL https://gist.github.com/Samg381/22dda7cc5e09c7b8080ddbf6b118a98a/raw/1432803ff4065a7209844644baa8f978dec3c28e/AmazonShippingAddressWarning.user.js
// @updateURL   https://gist.github.com/Samg381/22dda7cc5e09c7b8080ddbf6b118a98a/raw/1432803ff4065a7209844644baa8f978dec3c28e/AmazonShippingAddressWarning.user.js


// ==/UserScript==

(function() {


    var shipAddrDiv = document.getElementById('checkout-deliveryAddressPanel');


    if ( shipAddrDiv ){

        setInterval(blink, 1000);

        alert("Check shipping address!");

    }


    function blink() {

        shipAddrDiv.style.background = (shipAddrDiv.style.background == '#ffe300' ? '' : '#ffe300');

        setTimeout(function() {

            shipAddrDiv.style.background = (shipAddrDiv.style.background == 'white' ? '' : 'white');

        }, 500);

    }


})();