Hypnohub Auto-load Bigger Thumbnails

script.js

// ==UserScript==
// @name     Hypnohub Auto-load Bigger Thumbnails
// @version  1
// @grant    none
// @match    *://hypnohub.net/*
// @run-at   document-end
// @noframes
// ==/UserScript==
async function urlExists(url) {
  const ok = await fetch(url, {method: "GET"}).then(r => r.ok).catch(() => false)
  await sleep(50)
  return ok
}

async function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms))
}

(async function() {
  const imgs = [...document.querySelectorAll(`img.preview:not([alt*="video"])`)]
  for (const img of imgs) {
    await (async () => {
      const attempts = [
        (url) => url.replaceAll("thumbnail", "sample"),
        (url) => url
          .replaceAll("thumbnails", "images")
          .replaceAll("thumbnail_", "")
          .replace(".jpg", ".jpeg"),
        (url) => url
          .replaceAll("thumbnails", "images")
          .replaceAll("thumbnail_", "")
          .replace(".jpg", ".png"),
      ]
      for (const replace of attempts) {
        const url = replace(img.src)
        if (await urlExists(url)) {
          img.src = url
          return
        }
      }
    })()
  }
})()