hide codeforces problem tags except difficulty

codeforces_hide_tags.user.js

// ==UserScript==
// @name         codeforces hide tags but difficulty
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Thallium
// @match        https://codeforces.com/*
// @icon         https://codeforces.org/s/74991/favicon-96x96.png
// @grant        none
// ==/UserScript==

(function () {
  'use strict';
  const tags = document.getElementsByClassName('tag-box');
  for (const tag of tags) {
    if (tag.title !== 'Difficulty') {
      tag.parentNode.style.display = 'none';
    }
  }
  const handleClick = () => {
    for (const tag of tags) {
      if (tag.title !== 'Difficulty') {
        tag.parentNode.style.display =
          tag.parentNode.style.display==='block' ?
          'none' : 'block';
      }
    }
  };
  const btn = document.createElement('button');
  btn.innerHTML='toggle tags'
  btn.style.fontSize="1.2rem"
  btn.onclick=handleClick;
  tags[0].parentNode.parentNode.previousSibling.previousSibling.appendChild(btn)
  // Your code here...
})();