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nascent / Youtube like/dislike video and skip ad keyboard shortcuts

// ==UserScript==
// @name        Youtube like/dislike video and skip ad keyboard shortcuts
// @namespace   youtube
// @include     https://www.youtube.com/*
// @description Adds keyboard shortcuts [ and ] for liking and disliking videos, and s for skipping pre-video and banner ads.  Option for browser notfications
// @version     1.4
// @grant       GM_notification
// @run-at document-end
// @updateURL https://openuserjs.org/meta/nascent/Youtube_likedislike_video_and_skip_ad_keyboard_shortcuts.meta.js
// @downloadURL https://openuserjs.org/install/nascent/Youtube_likedislike_video_and_skip_ad_keyboard_shortcuts.user.js
// @license GPL-3.0-or-later
// ==/UserScript==

// Based on https://greasyfork.org/en/scripts/34049-youtube-like-dislike-video-and-skip-ad-keyboard-shortcuts/ by nerevar009 which hasn't been updated since 2017
//  changed skipad button class, added support for changing button indexed (happens when videos have dynamic buttons like "sponsor" buttons also buttons added by extensions )

var onvideopage, skipad, skipbannerad, videoinfo, buttons, like, dislike, tag;

var browserNotifications = false;

function findButtons() {
  if(!/^\/watch/.test(location.pathname)) {
    onvideopage = false;
    return;
  }
  onvideopage = true;

  skipad = document.getElementsByClassName("ytp-ad-skip-button ytp-button");
  if(skipad.length == 1)
    skipad = skipad[0];
  else skipad = null;

  skipbannerad = document.getElementsByClassName("close-padding");
  if(skipbannerad.length == 1)
    skipbannerad = skipbannerad[0];
  else skipbannerad = null;

  videoinfo = document.getElementsByTagName("ytd-video-primary-info-renderer");
  if(videoinfo.length == 1) {
    buttons = videoinfo[0].getElementsByTagName("button");

      for(let i = 0;i < buttons.length; i++) {
          if (buttons[i].className == "style-scope yt-icon-button") {
              var str = buttons[i].parentNode.label;
              if (str.match(/^dislike this video/gi)) {
                  dislike = buttons[i];
              }
              else if (str.match(/^like this video/gi)) {
                  like = buttons[i];
              }
          }
      }
  }
  else {
    like = null;
    dislike = null;
  }
}

findButtons();
var observer = new MutationObserver(findButtons);
observer.observe(document.documentElement, {childList: true, subtree: true});

// add keybindings
addEventListener("keypress", function(e) {
  if(!onvideopage)
    return;

  if(e.target.getAttribute("contenteditable") == "true")
    return;

  tag = e.target.tagName.toLowerCase();
  if(tag == "input" || tag == "textarea")
    return;

  if(e.code == "BracketLeft" && like){
      like.click();
      if (browserNotifications) {
          if (like.getAttribute("aria-pressed") == "true"){
              GM_notification({title:"Youtube",text: "Video Liked", silent:true, timeout: 2500});
          }
          else {
              GM_notification({title:"Youtube", text: "Like Removed From Video", silent:true, timeout: 2500});
          }
      }
  }
  else if(e.code == "BracketRight" && dislike){
      dislike.click();
      if (browserNotifications) {
          if (dislike.getAttribute("aria-pressed") == "true"){
              GM_notification({title:"Youtube", text: "Video Disliked", silent:true, timeout: 2500});
          }
          else {
              GM_notification({title:"Youtube", text: "Disike Removed From Video", silent:true, timeout: 2500});
          }
      }
  }
  else if(e.code == "KeyS") {
    if(skipad)
      skipad.click();
    else if(skipbannerad)
      skipbannerad.click();
  }
});