Open All Galleries EH

Adds a button to open every gallery on an E-Hentai / ExHentai listing page in background tabs, with a delay. Works in all view modes; click the button again to pause or resume.
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// ==UserScript==
// @name         Open All Galleries EH
// @namespace    open-all-galleries-eh
// @version      1.0.0
// @description  Adds a button to open every gallery on an E-Hentai / ExHentai listing page in background tabs, with a delay. Works in all view modes; click the button again to pause or resume.
// @author       Claude
// @license      MIT
// @icon         https://e-hentai.org/favicon.ico
// @match        https://e-hentai.org/*
// @match        https://exhentai.org/*
// @run-at       document-idle
// @noframes
// @grant        GM_openInTab
// ==/UserScript==

(function () {
  'use strict';

  const DELAY_MS = 1000;    // delay between opening each tab
  const CONFIRM_OVER = 30;  // ask before opening more than this many tabs

  // Collect gallery URLs from the results container. `.itg` is the list wrapper in
  // every view mode (Minimal/Compact tables, Extended/Thumbnail divs); the regex keeps
  // only /g/<gid>/<token>/ links, and the Set drops the cover+title duplicate per item.
  function galleryUrls() {
    const urls = [...document.querySelectorAll('.itg a[href]')]
      .map(a => a.href)
      .filter(h => /\/g\/\d+\/[0-9a-f]+/.test(h));
    return [...new Set(urls)];
  }

  function openUrl(url) {
    if (typeof GM_openInTab === 'function') {
      GM_openInTab(url, { active: false, insert: true });
    } else {
      window.open(url, '_blank'); // requires popups to be allowed for this site
    }
  }

  function createButton() {
    const btn = document.createElement('button');
    btn.id = 'link-opener-btn';
    btn.textContent = 'Open Galleries';
    btn.style.cssText =
      'position:fixed;top:20px;right:20px;z-index:9999;padding:10px;' +
      'background:#4f535b;color:#fff;border:2px solid #fff;border-radius:5px;' +
      'cursor:pointer;box-shadow:0 2px 5px rgba(0,0,0,0.5);';
    document.body.appendChild(btn);

    let state = 'idle';   // idle | running | paused
    let queue = [];
    let idx = 0;          // number of tabs already opened
    let timer = null;

    function finish() {
      state = 'idle';
      timer = null;
      queue = [];
      idx = 0;
      btn.textContent = 'Open Galleries';
      btn.style.background = '#4CAF50';
    }

    function openNext() {
      openUrl(queue[idx]);
      idx++;
      if (idx >= queue.length) { finish(); return; }
      btn.textContent = 'Opening ' + idx + '/' + queue.length + ' (click to pause)';
      timer = setTimeout(openNext, DELAY_MS);
    }

    function start() {
      const urls = galleryUrls();
      if (urls.length === 0) {
        alert('No galleries found on this page.');
        return;
      }
      const secs = Math.round(urls.length * DELAY_MS / 1000);
      if (urls.length > CONFIRM_OVER &&
          !confirm('Open ' + urls.length + ' galleries in background tabs?\n' +
                   'Takes about ' + secs + 's and may trip E-Hentai rate limits.')) {
        return;
      }
      queue = urls;
      idx = 0;
      state = 'running';
      btn.style.background = '#cccccc';
      openNext();
    }

    function pause() {
      clearTimeout(timer);
      timer = null;
      state = 'paused';
      btn.textContent = 'Paused ' + idx + '/' + queue.length + ' (click to resume)';
      btn.style.background = '#b8860b';
    }

    function resume() {
      state = 'running';
      btn.style.background = '#cccccc';
      openNext();
    }

    btn.addEventListener('click', () => {
      if (state === 'idle') start();
      else if (state === 'running') pause();
      else resume();
    });
  }

  if (galleryUrls().length > 0) createButton();
})();