https://github.com/Kurotaku-sama/Userscripts

z0r Controls.user.js

// ==UserScript==
// @name         z0r Controls
// @namespace    https://kurotaku.de
// @version      1.0
// @description  Use A & D or Left & Right arrows to navigate posts. Press Space to open comments
// @author       Kurotaku
// @license      CC BY-NC-SA 4.0
// @match        https://z0r.de/*
// @icon         https://www.google.com/s2/favicons?domain=z0r.de
// @updateURL    https://gist.github.com/Kurotaku-sama/4271cc2de480168c0ada068258ee956e/raw/z0r%2520Controls.user.js
// @downloadURL  https://gist.github.com/Kurotaku-sama/4271cc2de480168c0ada068258ee956e/raw/z0r%2520Controls.user.js
// @require      https://gist.github.com/Kurotaku-sama/1a7dcb227ce3d7a1b596afe725c0052a/raw/kuros_library.js
// @require      https://cdn.jsdelivr.net/npm/sweetalert2
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_addStyle
// @grant        GM_registerMenuCommand
// ==/UserScript==


let disqus_open = false;

(function() {
    document.onkeydown = check_key;
})();

function check_key(e) {
    e = e || window.event;
    let kc = e.keyCode;

    let unten = document.getElementById("unten");
    let prev = unten.getElementsByTagName("a")[0];
    let next = unten.getElementsByTagName("a")[2];

    if (kc == "37" || kc == "65")
        prev.click();
    else if (kc == "39" || kc == "68")
        next.click();
    else if (kc == "32" && !disqus_open) {
        disqus_open = true;
        document.getElementById("disqus_button").click();
    }
}