tiktok.com-Not-Found-landing-page-restore-initial-URL.user.js

// ==UserScript==
// @name        tiktok.com Not-Found landing page restore initial URL
// @namespace   https://greasyfork.org/en/users/85671-jcunews
// @version     1.0.1
// @license     AGPL v3
// @author      jcunews
// @description Context: https://www.reddit.com/r/userscripts/comments/11m0a61/can_someone_make_a_simple_script_that_doesnt_let/
// @match       *://*/*
// @include     *:*
// @grant       GM_getValue
// @grant       GM_setValue
// @run-at      document-start
// ==/UserScript==

/*
Notes:
- Only work when clicking a true HTML link with URL. i.e. will not work for fake links, buttons, JavaScript driven links,
  web browser bookmark, or if an URL is entered into browser addressbar.
- May sometimes not work if the link is on a page presented within an IFRAME. This is due to a bug in the GM provider browser
  extension (i.e. TamperMonkey, ViolentMonkey, etc.) where scripts may or may not run on page presented within an IFRAME.
*/

(url => {
  if (location.hostname === "www.tiktok.com") {
    if (/:\/\/www\.tiktok\.com\/notfound/.test(location.href) && (url = GM_getValue("url", ""))) addEventListener("load", () => history.pushState({}, "", url));
    addEventListener("load", () => {
      setTimeout(() => GM_setValue("url", ""), 2000)
    })
  }
  addEventListener("mousedown", e => {
    if ((e = e.target).closest && (e = e.closest("a")) && /^(www\.)tiktok\.com$/.test(e.hostname)) GM_setValue("url", e.href)
  }, true)
})()