Updates URL to current Youtube timestamp

script.js

// ==UserScript==
// @name         YouTube URL Timestamp Updater
// @namespace    http://tampermonkey.net/
// @version      2025-10-30
// @description  Updates the URL with the current video time without creating duplicates.
// @author       You
// @match        https://www.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// @author       Daniel Young
// ==/UserScript==

(function () {
  "use strict";

  setInterval(function () {
    const player = document.querySelector("#movie_player");

    if (player && typeof player.getCurrentTime === "function") {
      const currentTime = Math.floor(player.getCurrentTime());

      const url = new URL(window.location.href);

      url.searchParams.set("t", currentTime + "s");

      if (window.location.href !== url.href) {
        window.history.pushState({}, "", url.href);
      }
    }
  }, 2500);
})();