HeiseThreadEnabler.user.js

// ==UserScript==
// @author      PotcFdk
// @name        HeiseThreadEnabler
// @namespace   https://github.com/PotcFdk
// @description Auto-expands the thread view in the forums / comment sections.
// @match       https://www.heise.de/forum/heise-online/Kommentare/*/posting-*/show/
// @version     0.0.1
// @grant       none
// @icon        https://avatars.githubusercontent.com/u/8555894
// @homepageURL https://github.com/PotcFdk/userscripts/tree/master/HeiseThreadEnabler
// @supportURL  https://github.com/PotcFdk/userscripts/issues
// @downloadURL https://raw.githubusercontent.com/PotcFdk/userscripts/master/HeiseThreadEnabler/HeiseThreadEnabler.user.js
// @updateURL   https://raw.githubusercontent.com/PotcFdk/userscripts/master/HeiseThreadEnabler/HeiseThreadEnabler.meta.js
// ==/UserScript==

const showThreadLink = Array.from (document.getElementsByTagName ("a")).filter (a => a.href.includes("show-thread-below-posting"))[0];

if (showThreadLink) {
  location.replace (showThreadLink.href);
}