Tampermonkey script to switch playback speed on YouTube using Enhancer for YouTube

youtube-speed-toggle.user.js

// ==UserScript==
// @name         Enhancer for YouTube Speed Toggle
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  Toggle YouTube playback speed between normal and a preset speed using Enhancer for YouTube extension.
// @author       Re•MART
// @match        https://www.youtube.com/watch?*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    let timespeed = null;

    document.addEventListener('keydown', function(e) {
        if (e.ctrlKey && (e.key === '/' || e.key === '.')) {
            const settingsKey = 'enhancer-for-youtube';
            const storedSettings = JSON.parse(localStorage.getItem(settingsKey));
            const currentSpeed = storedSettings.speed;

            if (timespeed === null && currentSpeed !== 1) {
                timespeed = currentSpeed;
                storedSettings.speed = 1;
            } else if (currentSpeed === 1 && timespeed !== null) {
                storedSettings.speed = timespeed;
            } else if (currentSpeed !== 1) {
                timespeed = currentSpeed;
            }

            localStorage.setItem(settingsKey, JSON.stringify(storedSettings));
            // Trigger Enhancer for YouTube to read updated settings
            document.dispatchEvent(new Event('efyt-update-preferences'));
        }
    });
})();