clickable.js

// ==UserScript==
// @name         Clickable list items
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  make rooms clickable.
// @author       NI57721
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  // Your code here...
  const addButtonAttribute = () => {
    const btnClass = "vimium_button";
    const itemList = document.querySelectorAll("[class*=item]");
    let isChildrenClickable = false;
    Array.from(itemList).forEach(element => {
      const children = element.children;
      Array.from(children).forEach(child => {
        const grandchildren = child.children;
        Array.from(grandchildren).forEach(grandchild => {
            grandchild.classList.add(btnClass)
            isChildrenClickable = true;
        });
        if(!isChildrenClickable)
          child.classList.add(btnClass);
          isChildrenClickable = true;
      });
      if(!isChildrenClickable)
        element.classList.add(btnClass);
        isChildrenClickable = true;
    });
  };

  document.addEventListener('keydown', addButtonAttribute, true);
  document.addEventListener('click', addButtonAttribute);
  window.onload = () => {setTimeout(addButtonAttribute, 5000);};
})();