Keep YT Sidebar Open

Fuck youtube & keep the sidebar open goddamnit

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         Keep YT Sidebar Open
// @namespace    https://www.youtube.com/
// @version      2025-07-23
// @description  Fuck youtube & keep the sidebar open goddamnit
// @author       trevor229
// @match        https://www.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// ==/UserScript==

(function () {
  function waitForSidebarIcon(callback) {
    const selector = 'ytd-mini-guide-renderer ytd-mini-guide-entry-renderer a#endpoint';

    const el = document.querySelector(selector);
    if (el) return callback();

    const observer = new MutationObserver(() => {
      const el = document.querySelector(selector);
      if (el) {
        observer.disconnect();
        callback();
      }
    });

    observer.observe(document.body, { childList: true, subtree: true });
  }

  waitForSidebarIcon(() => {
    const masthead = document.querySelector('ytd-masthead');
    if (masthead) {
      masthead.removeAttribute('visible');
      masthead.setAttribute('persistent-and-visible', '');
    }

    const appDrawer = document.querySelector('tp-yt-app-drawer');
    if (appDrawer) {
      appDrawer.setAttribute('opened', '');
    }

    const app = document.querySelector('ytd-app');
    if (app) {
      app.removeAttribute('mini-guide-visible');
      app.setAttribute('guide-persistent-and-visible', '');
    }

    const miniGuide = document.querySelector('ytd-mini-guide-renderer');
    if (miniGuide) {
      miniGuide.setAttribute('hidden', '');
    }

    console.log('Sidebar fully opened!');
  });
})();