Enable Ad Markers

Bring back ad markers on YouTube videos.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Enable Ad Markers
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Bring back ad markers on YouTube videos.
// @author       BowDown097
// @match        *://*.youtube.com/*
// @match        *://*.youtu.be/*
// @icon         https://www.google.com/s2/favicons?domain=youtube.com
// ==/UserScript==

// Big thanks to https://greasyfork.org/en/scripts/32626-disable-youtube-video-ads for the youtubei player patching logic

((window, fn) => {
    var ytiPlayer;
    JSON.parseOG = JSON.parse;
    JSON.parse = function(obj) {
        if (ytiPlayer) {
            obj = ytiPlayer;
            if (obj.forEach) {
                obj.forEach((p, a) => {
                    if (p.player?.args?.player_response) {
                        a = p.player_response_;
                        patchPlayerResponse(a);
                        p.player_response = JSON.stringify(a);
                    } else if (p.playerResponse) {
                        patchPlayerResponse(p.playerResponse);
                    }
                });
            } else patchPlayerResponse(obj);
            ytiPlayer = null;
        } else {
            obj = JSON.parseOG(obj);
            if (obj.playerResponse) patchPlayerResponse(obj.playerResponse);
        }
        return obj;
    };

    var rt = Response.prototype.text;
    Response.prototype.text = function() {
        const rtThis = this, text = rt.apply(this, arguments), thenOG = text.then;
        text.then = function(fn) {
            var fnOG = fn;
            fn = function(t) {
                if (/\/v1\/player\?/.test(rtThis.url)) ytiPlayer = JSON.parseOG(t);
                if (typeof fnOG === "function") return fnOG.apply(this, arguments);
            };
            return thenOG.apply(this, arguments);
        };
        return text;
    };

    function patchPlayerResponse(playerResponse) {
        playerResponse.adPlacements?.forEach(p => {
            p.adPlacementRenderer.config.adPlacementConfig.hideCueRangeMarker = false;
        });
    }
})();