Tired of YouTube shorts? This will transform any YouTube short into a normal video. Paste this in Tampermonkey/Greasemonkey.

anti-shorts.js

// ==UserScript==
// @name         Anti-Shorts
// @namespace    http://tampermonkey.net/
// @version      0.0.1
// @description  Tired of YouTube shorts? We are too! Transform any YouTube short into a normal video.
// @author       Airbus-A330
// @match        *.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// ==/UserScript==
(function() {
    'use strict';

    // CREDIT: https://phpcoder.tech/detect-url-change-in-javascript-without-refresh/

    let lastURL = location.href;

    new MutationObserver(() => {
        const url = location.href;
        if (url !== lastURL) {
            lastURL = url;
            disableShorts();
        }
    }).observe(document, {
        subtree: true,
        childList: true
    });


    function disableShorts() {
        if (location.href.includes("shorts")) {
            window.location.href = location.href.replace("/shorts/", "/watch?v=");
        }
    }
})();