Auto Fast-forward YouTube ads -> https://github.com/szepeviktor/fast-forward-youtube-ads

youtube-ads-ff.js

document.querySelector("#container video.html5-main-video").onwaiting = (event) => {
    var to;
    var cnt = 0;
    var ov = event.target.volume;

    if (document.querySelector("#movie_player.ad-created") === null) {
        return;
    }

    to = setTimeout(() => {
        var skip = document.querySelector("[id^=ad-text].ytp-ad-skip-button-text");
        cnt = cnt + 1;
        console.log("Looking for skip button");
        if (skip !== null) {
            console.log("Clicking skip button");
            event.target.playbackRate = 1;
            event.target.volume = ov;
            skip.click();
            clearTimeout(to);
        } else if (document.querySelector("#movie_player.ad-created") !== null) {
            console.log("Fast-forwarding ad");
            event.target.volume = 0.01;
            event.target.playbackRate = 10;
        } else if (document.querySelector("#movie_player.ad-created") === null) {
            console.log("Ad has finished");
            event.target.playbackRate = 1;
            event.target.volume = ov;
            clearTimeout(to);
        } else if (cnt >= 10) {
            console.log("10+ runs");
            clearTimeout(to);
        }
    }, 1000);
};

Get storyboard URL

document.querySelector("#movie_player .ytp-tooltip .ytp-tooltip-bg").style.backgroundImage.replace(/url\("(.+)"\)/, '$1')