test.user.js

// ==UserScript==
// @name            New Userscript
// @version         0.1.0
// @description     try to take over the world!
// @author          Karen
// @namespace       https://github.com/gopkg-dev/amazon_scripts
// @supportURL      https://github.com/gopkg-dev/amazon_scripts
// @updateURL       https://raw.githubusercontent.com/gopkg-dev/amazon_scripts/main/test.user.js
// @downloadURL     https://raw.githubusercontent.com/gopkg-dev/amazon_scripts/main/test.user.js
// @icon            data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" width="24" stroke-width="2" fill="none" stroke="currentColor"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"></path></svg>
// @license         GPL-2.0-only
// @match           https://*
// @run-at          document-idle
// @grant           unsafeWindow
// @run-at          document-idle
// ==/UserScript==

(function () {
    'use strict';

    // Your code here...
})();