Fast forward youtube ads to skip them in 0.5 second

youtube-ad-accelerator.user.js

// ==UserScript==
// @name         YouTube Ads Accelerator
// @namespace    https://youtube.com/
// @version      1.1
// @author       Kebablord 
// @description  Speed up YouTube ads by 200x when they appear
// @match        https://www.youtube.com/*
// @grant        none
// @run-at       document-end
// @updateURL    https://gist.githubusercontent.com/KebabLord/0cd4b0391fba147869fbdac10fc31621/raw/youtube-ad-accelerator.user.js
// @downloadURL  https://gist.githubusercontent.com/KebabLord/0cd4b0391fba147869fbdac10fc31621/raw/youtube-ad-accelerator.user.js
// ==/UserScript==

// Firefox supports unlimited video playback speed while Chromium based browsers support maximum 16 
const isFirefox = /firefox/i.test(navigator.userAgent);
const maxRate = isFirefox ? 200 : 16;

(function() {
    'use strict';

    async function accelerateAdPlayback() {
        const isAdVisible = () => {
            const el = document.querySelector('div.ytp-ad-player-overlay-layout__ad-info-container');
            return el && el.offsetParent !== null;
        };

        const wait = (ms) => new Promise(resolve => setTimeout(resolve, ms));

        const trySpeedUpAd = async () => {
            if (!isAdVisible()) return;

            const ad = document.querySelectorAll('video.video-stream.html5-main-video')[0];
            if (!ad || ad.paused) return;

            ad.playbackRate = maxRate;

            while (!ad.paused) {
                await wait(100);
            }
        };

        setInterval(() => {
            trySpeedUpAd();
        }, 500);
    }

    accelerateAdPlayback();
})();