rule 34 direct image links

gives direct links to images on rule 34.xxx, useful for mouseover addons
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// ==UserScript==
// @name         rule 34 direct image links
// @namespace    heck
// @version      0.1
// @description  gives direct links to images on rule 34.xxx, useful for mouseover addons
// @author       You
// @match        https://rule34.xxx/index.php?page=post&s=list*
// @exclude      https://rule34.xxx/index.php?page=post&s=view*
// @require      https://code.jquery.com/jquery-3.3.1.js
// @grant        none
// ==/UserScript==

Array.prototype.forEach.call($(".thumb"), function(el) {
    let newSpan = document.createElement("span");
    let currentLink = el.children[0].children[0].src;
    // newSpan.style.padding-bottom = "3px";
    let jpgVersion = currentLink.replace("thumbnails", "\/images").replace("thumbnail_", "").replace(/\.jpg\?\d+/, ".jpg");
    let jpegVersion = currentLink.replace("rule34", "img.rule34").replace("thumbnails", "\/images").replace("thumbnail_", "").replace(/\.jpg\?\d+/, ".jpeg");
    let pngVersion = currentLink.replace("thumbnails", "\/images").replace("thumbnail_", "").replace(/\.jpg\?\d+/, ".png");
    let webmVersion = currentLink.replace("rule34", "bimg.rule34").replace("thumbnails", "\/images").replace("thumbnail_", "").replace(/\.jpg\?\d+/, ".webm");
    let gifVersion = currentLink.replace("rule34", "img.rule34").replace("thumbnails", "\/images").replace("thumbnail_", "").replace(/\.jpg\?\d+/, ".gif");
    newSpan.innerHTML = `<br><a href=${jpgVersion}>jpg</a> &nbsp; <a href=${jpegVersion}>jpeg</a> &nbsp; <a href=${pngVersion}>png</a> &nbsp; <a href=${gifVersion}>gif</a> &nbsp; <a href=${webmVersion}>webm</a>`;
    el.children[0].after(newSpan);
});