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nascent / Hide Amazon's Checkout flyout sidebar

// ==UserScript==
// @name         Hide Amazon's Checkout flyout sidebar
// @namespace    http://amazon.com/
// @version      0.2
// @description  Hide Amazon's weird ugly Checkout flyout sidebar.
// @author       nascent
// @match        https://*.amazon.com.br/*
// @match        https://*.amazon.ca/*
// @match        https://*.amazon.com.mx/*
// @match        https://*.amazon.com/*
// @match        https://*.amazon.cn/*
// @match        https://*.amazon.in/*
// @match        https://*.amazon.co.jp/*
// @match        https://*.amazon.sg/*
// @match        https://*.amazon.ae/*
// @match        https://*.amazon.sa/*
// @match        https://*.amazon.fr/*
// @match        https://*.amazon.de/*
// @match        https://*.amazon.it/*
// @match        https://*.amazon.nl/*
// @match        https://*.amazon.pl/*
// @match        https://*.amazon.es/*
// @match        https://*.amazon.se/*
// @match        https://*.amazon.com.tr/*
// @match        https://*.amazon.co.uk/*
// @match        https://*.amazon.com.au/*
// @icon         https://www.google.com/s2/favicons?domain=amazon.co.uk
// @updateURL    https://openuserjs.org/meta/nascent/Hide_Amazons_Checkout_flyout_sidebar.meta.js
// @downloadURL https://openuserjs.org/install/nascent/Hide_Amazons_Checkout_flyout_sidebar.user.js
// @license      GPL-3.0-or-later
// @grant       GM_addStyle
// @run-at       document-start
// ==/UserScript==

// version 0.2 - Removes checkout bar after page load too
// version 0.1 - initial release

function RemoveCheckout() {

    var div = document.getElementById("nav-flyout-ewc");
    if (div) {
        div.parentNode.removeChild(div);
    }

    GM_addStyle ( '.nav-ewc-persistent-hover.a-js body {padding-right: 0px !important;}' );
    console.log("remove amazon checkout bar");
}

(function() {
    'use strict';
    RemoveCheckout();
})();

window.onload = function(){
    console.debug("window.onload");
    // Select the node that will be observed for mutations

    var targetNode = document.body;

    // Options for the observer (which mutations to observe)
    var config = { attributes: true, childList: true, subtree: true };
RemoveCheckout();
    // Callback function to execute when mutations are observed
    var callback = function(mutationsList) {
        for(var mutation of mutationsList) {
            //If window content has changed, and type is a list item node, then update
            if (mutation.type == 'childList') {
                if (mutation.addedNodes.length >= 1) {
                    if (mutation.addedNodes[0].nodeName == 'DIV') {
						RemoveCheckout();
                    }
                }
            }
        }
    };

    // Create an observer instance linked to the callback function
    var observer = new MutationObserver(callback);

    // Start observing the target node for configured mutations
    observer.observe(targetNode, config);
};