Tampermonkey: Strip header/footer from medium.freecodecamp.org

tamper.js

// ==UserScript==
// @name         Strip header/footer from medium.freecodecamp.org
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  stip header/footer
// @author       Ivaylo Novakov
// @match        https://medium.freecodecamp.org/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    let headers = document.getElementsByClassName('metabar');
    for(let i=0; i < headers.length; i++) {
        headers[i].style.visibility = 'hidden';
    }
    let footers = document.getElementsByClassName('js-stickyFooter');
    for(let i=0; i < footers.length; i++) {
        footers[i].style.visibility = 'hidden';
    }
})();