pixiv_vertical_listing.user.js

// ==UserScript==
// @name           pixiv vertical listing
// @namespace      http://d.hatena.ne.jp/eagletmt/
// @include        http://www.pixiv.net/tags.php*
// @include        http://www.pixiv.net/search.php*
// @include        http://www.pixiv.net/bookmark_new_illust.php*
// @description    こんなかんじに縦に表示 http://gyazo.com/361f385af3df45064658f8ed671f8e0c
// ==/UserScript==

(function() {
  GM_addStyle([
    '.search_a2_result li { float: none; width: auto; }',
    '.search_a2_result a { font-size: large; }',
  ].join(''));

  window.addEventListener('AutoPagerize_DOMNodeInserted', function(evt) { replaceImages(evt.target); }, false);
  replaceImages(document.querySelector('.search_a2_result'));

  function replaceImages(target) {
    Array.prototype.forEach.call(target.getElementsByTagName('img'), function(img) {
      img.src = img.src.replace(/_s(\.\w+$)/, '_m$1');
    });
  }
})();