Add a magnet link shortcut and thumbnails of torrents. Also adds a google image search link in case you want to see more pics of the torrent.

RARBG_Add Link & thumbnails.user.js

// ==UserScript==
// @name         RARBG - Add Magnet Link & thumbnails!
// @namespace    https://github.com/buzamahmooza
// @version      0.5.3
// @description  Add a magnet link shortcut and thumbnails of torrents.
// @description  Also adds a google image saerch link in case you want to see more pics of the torrent.
// @author       Cisco, forked by Faris Hijazi
// @include      https://rarbg.to/*
// @include      http://rarbgmirror.xyz/*
// @include      https://rarbgunblock.com/*
// @include      https://rarbg.unblocked.st/*
// @include      https://*rarbg*
// @grant        unsafeWindow
// @grant	     GM_setValue
// @grant        GM_getValue
// @updateUrl    https://gist.github.com/buzamahmooza/dccc1825be7e6a75127883a899e3a9a9/raw/
// @require      http://code.jquery.com/jquery-latest.js
// @require      https://unpkg.com/in-view@0.6.1/dist/in-view.min.js
// Original link 1:      https://greasyfork.org/scripts/12648-rarbg-add-magnet-link/code/RARBG%20-%20Add%20Magnet%20Link.user.js
// Original link 2:      https://greasyfork.org/scripts/23493-rarbg-torrent-and-magnet-links/code/RARBG%20-%20torrent%20and%20magnet%20links.user.js
// ==/UserScript==

// ideas:
// [ ] make a link that downloads all the images on the torrent page via xml request
// [ ] sound on mouse hover
// [ ]

const DBG = false; // debug mode (setting this to false will disable the console logging)
var currentDocument = document;
const SEARCH_ICON_URL = "https://cdn4.iconfinder.com/data/icons/ionicons/512/icon-ios7-search-strong-128.png";
const TORRENT_DL_ICO = "https://dyncdn.me/static/20/img/16x16/download.png";
const MAGNET_ICO = "https://dyncdn.me/static/20/img/magnet.gif";
const GoogleImagesSearchURL = "https://encrypted.google.com/search?&hl=en&tbm=isch&q=";
const trackers = 'http%3A%2F%2Ftracker.trackerfix.com%3A80%2Fannounce&tr=udp%3A%2F%2F9.rarbg.me%3A2710&tr=udp%3A%2F%2F9.rarbg.to%3A2710';
// "http://icons.iconarchive.com/icons/custom-icon-design/mono-general-2/512/search-icon.png"; // search icon
const useGoogleImages = true;
function getDdgSearchURL(q){return "https://duckduckgo.com/?q=" + encodeURIComponent(q) + "&atb=v73-5__&iar=images&iax=images&ia=images";}
var tbodyEl = document.querySelector('body > table:nth-child(6) > tbody > tr > td:nth-child(2) > div > table > tbody > tr:nth-child(2) > td > table.lista2t > tbody');

const bigPics = false;
const nextPage = document.querySelector('a[title="next page"]'),
	  prevPage = document.querySelector('a[title="previous page"]');
var usingSmallThumbnails = GM_getValue('usingSmallThumbnails', true);

//if on a single torrent page, it gets special treatment
if(matchSite(/\/torrent\//)){
	var torrents = document.querySelectorAll('tr.lista_related td:nth-child(1) [href^="/torrent/"]');
	for (var i = 0; i < torrents.length; i++) {
		let thb = getMouseoverThumbnail(torrents[i]);
		//creating and adding the elements
		var cell =       document.createElement('td'),
			magnetLink = document.createElement('a'),
			magnetImg =  document.createElement('img');
		magnetLink.href = torrents[i].href;

		cell.classList.add('magnet-cell');
		cell.appendChild(magnetLink);
		// thumbnail
		magnetImg.classList.add('preview-image');
		magnetImg.src = thb;
		magnetLink.appendChild(magnetImg);

		torrents[i].parentNode.parentNode.after(cell, torrents[i].parentNode);
	}
	if(DBG) console.log('You should see '+i+' thumbnails now.');
	return;
}

inView('#pager_links').on('enter', function(){
	appendPage(currentDocument.querySelector('a[title="next page"]'));
});

clickToVerifyBrowser();

var addedColumnHeader = false;
var title = 'DL&nbsp;ML';
var mls = appendColumn();
// try{ document.querySelector('body > table:nth-child(6) > tbody > tr > td:nth-child(2) > div > table > tbody > tr:nth-child(2) > td > table.lista2t').style.width = "1300px"; }catch(exception){}
var magnetImgData = 'data:image/svg+xml;base64,';
let width = 150, maxwidth = 150;
width = bigPics ? width*2 : width;
maxwidth = bigPics ? maxwidth*2 : maxwidth;
let maxheight = 300;

var cssRules = '' +
	'.magnet-cell { text-align: center; } ' +
	'.magnet-cell a img { transition: transform 250ms ease; width:'+width+'px; max-width:'+maxwidth+'max-width:'+maxheight+';translate3d(0, 0, 100); padding:5px 5px; } ' +
	// '.magnet-cell a img { transition: transform 250ms ease; width:100px; max-width:150;translate3d(0, 0, 100); padding:5px 5px; } ' +
	'.magnet-cell a:hover img { transform: scale(1.6, 1.6); } ' +
	'.a.gs a: hover img { transform: scale(1.3, 1.3); } ' +
	'a.gs:link {color: red;}'+
	'a.gs:visited {color: green;}'+
	'a.gs:hover {color: hotpink;}'+
	'a.gs:active {color: blue;}'+
	'a.gs: {font-size: 8px; padding:5px 5px;}';
var cssBlock = document.createElement('style');
cssBlock.innerText = cssRules;
fixCss();

document.getElementsByTagName('head')[0].appendChild(cssBlock);

var headCell = document.createElement('td');
headCell.innerHTML = 'Thumbnails';
headCell.classList.add('header6');
headCell.classList.add('header40');

// Adds the click functionality to the Thumbnails header
headCell.addEventListener('click', function(e) { toggleThumbnailSize(); });
var torrents = [];


observeDocument(dealWithTorrents);
function observeDocument(callback) {
	callback(document.body);
	new MutationObserver(function(mutations){
		for (var i = 0; i < mutations.length; i++) {
			if (!mutations[i].addedNodes.length) continue;
			callback(mutations[i].target);
		}
	}).observe(document.body, {
		childList: true, subtree: true,
		attributes: false, characterData: false
	});
}

document.querySelector('.lista2t tr:first-child td:nth-child(2)').parentNode.insertBefore(headCell, document.querySelector('.lista2t tr:first-child td:nth-child(2)'));
function dealWithTorrents(node) {
	torrents = node.querySelectorAll('.lista2 td:nth-child(2) [href^="/torrent/"]');
	if(DBG) console.log('torrents.length: '+torrents.length);
	for (var i=0; i<torrents.length; i++) {
		//creating and adding the elements
		var cell =       document.createElement('td'),
			magnetLink = document.createElement('a'),
			magnetImg =  document.createElement('img');

		try{
			magnetLink.href =
				getTorrentDownloadLinkFromAnchor(torrents[i]);
			// getTorrentDownloadLink(torrents[i].parentNode);
		}catch(e){ magnetLink.href = mls[i]; if(DBG) console.log('Using mls for MagnetLink:', mls[i]); }
		// magnetLink.href = mls[i];

		cell.classList.add('magnet-cell');
		cell.appendChild(magnetLink);
		cell.style = "height: 200px; width: 301px;";
		// thumbnail
		magnetImg.classList.add('preview-image');
		let thumb = getMouseoverThumbnail(torrents[i]);
		createAndAddAttribute(magnetImg, 'smallSrc',  thumb);
		createAndAddAttribute(magnetImg, 'bigSrc',  getLargeThumbnail(thumb));

		setThumbnail(magnetImg);
		magnetLink.appendChild(magnetImg);

		torrents[i].parentNode.parentNode.insertBefore(cell, torrents[i].parentNode);
	}
	torrents.forEach(function(e){ addImageSearchAnchor(e); });
}

function setThumbnail(magnetImg){
	magnetImg.src = magnetImg.getAttribute((usingSmallThumbnails ? 'smallSrc' : 'bigSrc'));
}
function toggleThumbnailSize(){
	usingSmallThumbnails = !usingSmallThumbnails;
	GM_setValue('usingSmallThumbnails', usingSmallThumbnails);
	document.querySelectorAll('.preview-image').forEach(function(e){
		setThumbnail(e);
	});
	fixCss();
	if(DBG) console.log('toggling thumbnail sizes. usingSmallThumbnails = ', usingSmallThumbnails);
}
function fixCss(){
	cssBlock.innerText =  '' +
		'.magnet-cell { text-align: center; } ' +
		'.magnet-cell a img { transition: transform 250ms ease; width:'+ (usingSmallThumbnails ? width : width*2) +'px; max-width:' +
		(usingSmallThumbnails ? width : maxwidth*2) + ';translate3d(0, 0, 100); padding:5px 5px; } ' +
		'.magnet-cell a:hover img { transform: scale(1.3, 1.3); } ' +
		'.a.gs a: hover img { transform: scale(1.3, 1.3); } ' +
		'a.gs:link {color: red;}'+
		'a.gs:visited {color: green;}'+
		'a.gs:hover {color: hotpink;}'+
		'a.gs:active {color: blue;}'+
		'a.gs: {font-size: 8px; padding:5px 5px;}'
	;
}
function tryBigImage(img){
	img.addEventListener("error", bigThumbHandleError);
	img.oldSrc = img.src;
	img.src = getLargeThumbnail(img.src);
}
function bigThumbHandleError(){
	this.removeEventListener("error", bigThumbHandleError);
	this.src = this.oldSrc;
	console.warn('Failed to load big thumbnail for', this.src, ' Attempting xml request');
	addMagnetCell(this.parentNode);
}
// gets the large thumbnail from the small thumbnail (works for rarbg thumbnails)
function getLargeThumbnail(smallThumbUrl){
	// Movie example
	// Small pic:	http://dyncdn.me/mimages/316661/over_opt.jpg
	// Big pic:		http://dyncdn.me/mimages/316661/poster_opt.jpg
	return smallThumbUrl
		.replace('over_opt','poster_opt') // movie thumbnail replacement
	// other thumbnail replacement
		.replace ( 'static/over', 'posters2/'+smallThumbUrl.replace(/(.*?)over\//,'').charAt(0) ) //put "posters2" + the first character after the '/'
	;
}
function createAndAddAttribute(node, attributeName, attributeValue){
	if(!node) { console.error('Node is null, cannot add attribute.'); return; }

	var att = document.createAttribute(attributeName);
	att.value = attributeValue;
	node.setAttributeNode(att);
}

/** @Return returns the link from the 'onmouseover' attribute */
function getMouseoverThumbnail(node){
	if(!node)console.warn('null torrent anchor:', node);
	let thb = '';
	try {
		// thb = thb.match(/(?<=(return overlib('\<img src\=\')))(.*?)(?=(\' border\=0\>\'))/i)[0];
		thb = node.getAttribute('onmouseover');
		thb = thb.substring("return overlib('<img src=\'".length+1, thb.length - "\' border=0>'".length-2);
	} catch(r) {
		thb = magnetImgData;
		if(DBG) console.error('getMouseoverThumbnail error:', r);
		// console.log("node with error:\t"+node);
	}
	return thb;
}
function addImageSearchAnchor(torrentAnchor){
	var searchTd = document.createElement('td'),
		searchLink = document.createElement('a'),
		frame = document.createElement('iframe'),
		searchImg = document.createElement('img')
	;
	searchTd.style = "border-top-width: 10px; padding-top: 10px;";

	let q = torrentAnchor.title
	.replace(/rarbg|\.com|\#|x264|DVDRip|720p|1080p|2160p|MP4|IMAGESET|FuGLi|SD|KLEENEX|BRRip|XviD|MP3|XVID|BluRay|HAAC|WEBRip|DHD|rartv|KTR|YAPG/gi,"") //replacing common useless torrent terms
	.replace(/(\d+\.(\d+)\.(\d+))|[\d]{3,}/g," ") // replace dates (numbers with dots between them)
	.replace(/[^\w\d]|_/g," ") // replaces non-alpha and non-word characters
	.replace(/\s\s+/g,' ')	// removes double spaces
	.trim()
	;

	frame.src = getDdgSearchURL(q);
	frame.height="200";
	frame.width="300";
	searchLink.href = (useGoogleImages) ? (GoogleImagesSearchURL + q) : getDdgSearchURL(q);
	searchLink.classList.add('gs');
	searchLink.target = "_blank";

	let showGeneratedSearchQuery = true;
	// searchLink.innerHTML = ((useGoogleImages) ? "Google" : "DDG") + " Image Search";

	var searchEngineText = document.createElement('p5');
	var qText = document.createElement('p6');
	searchEngineText.innerHTML = (((useGoogleImages) ? "Google" : "DDG") + " Image Search");
	qText.innerHTML = (showGeneratedSearchQuery)?':\t'+q: '';

	let searchIcon = document.createElement('img');
	searchIcon.src = SEARCH_ICON_URL;

	searchIcon.style.height = '20px';
	searchIcon.style.width = '20px';

	searchLink.style.padding = '20px';
	searchTd.appendChild(searchLink);
	searchLink.before(searchIcon);
	searchLink.appendChild(searchEngineText);
	searchLink.appendChild(qText);

	torrentAnchor.after(searchTd);
}

function appendPage(pageLink) {
	tb = document.createElement('tr');
	pageAnchor = createElement('<td><a href="'+pageLink+'"><p1>Go to page</p1></a></td>');
	tb.appendChild(pageAnchor);
	tbodyEl.appendChild(tb);

	var url = pageLink;
	var req = new XMLHttpRequest();
	req.open('GET', url);
	req.send();
	req.onreadystatechange = function() {
		if (req.readyState == 4) {
			var pageHTML = req.responseText;
			currentDocument = document.createElement('html');
			currentDocument.innerHTML = pageHTML;
			var lista2s = currentDocument.querySelectorAll('tbody>.lista2');
			if(DBG) console.log('lista2s:', lista2s);
			lista2s.forEach(function(e){
				tbodyEl.appendChild(e);
				appendColumnSingle(e.childNodes[1]);
			});
		}
	};
}
function addMagnetCell(torrent){
	var url = torrent.href;
	var req = new XMLHttpRequest();
	req.open('GET', url);
	req.send();
	req.onreadystatechange = function() {
		if (req.readyState == 4) {
			var pageHTML = req.responseText;
			var magnetURL = pageHTML.match(/href\=\"(magnet[\:\_\-\+\%\?\=\&\;\.0-9a-zA-Z]*)\"/)[1]; //match magnet URL
			var thumbURLs = pageHTML.match("src\=\"((.?)*\.jpg)\"");

			//creating and adding the elements
			var magnetCell = document.createElement('td'),
				magnetLink = document.createElement('a'),
				magnetImg = document.createElement('img');
			magnetLink.href = magnetURL;
			magnetCell.classList.add('magnet-cell');
			magnetCell.appendChild(magnetLink);

			magnetImg.src = thumbURLs[1];
			if(!thumbURLs[1]) magnetImg = magnetImgData;
			magnetLink.appendChild(magnetImg);
			torrent.parentNode.parentNode.replaceChild(magnetCell, torrent.parentNode.parentNode.childNodes[1]);
		}
	};
}
function clickToVerifyBrowser(){
	document.querySelectorAll('a[href^="/threat_defence.php?defence=1"]').forEach(function(a){
		a.click();
	});
}

window.onkeyup = function(e) {
	var key = e.keyCode ? e.keyCode : e.which;
	switch(key){
		case 37: // Left arrowKey
			e.preventDefault();
			prevPage.click();
			break;
		case 39:// Right arrowKey
			e.preventDefault();
			nextPage.click();
			break;
		case 192: // ' ` ' key
			toggleThumbnailSize();
			break;
	}
};
/** Create an element by typing it's inner HTML.
 example:   var myAnchor = createElement('<a href="https://example.com">Go to example.com</a>');*/
function createElement(html) {
	var div = document.createElement('div');
	div.innerHTML = html;
	return div.childNodes[0];
}
unsafeWindow.dlTorrents = dlTorrents;
function dlTorrents() { console.log('dlTorrents');
	if(confirm('Would you like to download all the torrents on the page?'))
		document.querySelectorAll(".torrent_dl").forEach(function(e, i) {
			e.click();
			console.log(i, e.href);
		});
}


// the magnet and url buttons
// @source: https://greasyfork.org/scripts/23493-rarbg-torrent-and-magnet-links/code/RARBG%20-%20torrent%20and%20magnet%20links.user.js
function fixCell(cell){
	cell.setAttribute('class', 'lista');
	cell.setAttribute('width', '50px');
	cell.setAttribute('align', 'center');
}
function appendColumn() {
	var array = [];
	// the initial column 'Files' after of which the extra column will be appended
	// document.querySelectorAll('.lista2t > tbody > tr > td:nth-child(2) ').forEach(function(entry){		// creation of the extra column
	// 	entry.insertAdjacentHTML('afterend', `<td>` + title + `</td>`);
	// });
	// add header
	if(!addedColumnHeader) {
		var nearHeader = document.querySelector('.lista2t > tbody:nth-child(1) > tr:nth-child(1) > td:nth-child(3)'); // the first cell (header cell) of the new column
		var header = nearHeader.cloneNode(false);
		nearHeader.before(header);
		nearHeader = undefined; // clear memory

		header.setAttribute('class', 'header6');
		header.setAttribute('align', 'center');
		header.setAttribute('id', 'DL-header');

		var dlAnchor = createElement('<a>DL</a>');
		dlAnchor.addEventListener('click', dlTorrents);
		header.appendChild(dlAnchor);

		addedColumnHeader = true;
	}

	// the rest cells of the new column
	document.querySelectorAll('.lista2t > tbody > tr[class="lista2"] > td:nth-child(3)').forEach(fixCell);
	var oldColumn = document.querySelectorAll('.lista2t > tbody > tr[class="lista2"] > td:nth-child(2)');		// torrent links
	// populate the cells in the new column with DL and ML links
	oldColumn.forEach(function(col) {
		array.push(appendColumnSingle(col));
	});
	return array;
}

function addDlAndMl(torrentAnchor, cellNode) {
	torrentAnchor.innerHTML = '<a href="' + getTorrentDownloadLink(cellNode) + ' class="torrent_dl" target = "_blank" >' +
		'<img src="' + TORRENT_DL_ICO + '"">' + '</>'; // torrent download

	// matches anything containing "over/*.jpg" *: anything
	var hash = (/over\/(.*)\.jpg\\/).test(cellNode.firstChild.outerHTML) ? cellNode.firstChild.outerHTML.match(/over\/(.*)\.jpg\\/)[1] : undefined;

	let title = cellNode.firstChild.innerText;
	torrentAnchor.innerHTML += (hash !== undefined) ?
		('&nbsp;<a class="torrent_ml" href="magnet:?xt=urn:btih:' + hash + '&dn=' + title + '&tr=' + trackers + ' ">' + '<img src="' + MAGNET_ICO + '""></>'):
	'&nbsp;&nbsp;&nbsp;&nbsp;'; // magnet ink

	return ('magnet:?xt=urn:btih:' + hash + '&dn=' + title + '&tr=' + trackers);
}

function getTorrentDownloadLink(oldColumn){
	return oldColumn.firstChild.href.replace('torrent/', 'download.php?id=') + '&f=' + oldColumn.firstChild.innerText + '-[rarbg.com].torrent"';
}
function getTorrentDownloadLinkFromAnchor(anchor){
	return anchor.href.replace('torrent/', 'download.php?id=') + '&f=' + anchor.innerText + '-[rarbg.com].torrent';
}

function appendColumnSingle(torrentAnchor) {
	if(torrentAnchor.classList.contains('has-torrent-DL-ML')) return;
	// the initial column 'Files' after of which the extra column will be appended
	// creation of the extra column

	torrentAnchor.insertAdjacentHTML('afterend', `<td>` + title + `</td>`);
	torrentAnchor.classList.add('has-torrent-DL-ML');
	// add header
	if(!addedColumnHeader) (function (){
		var header = document.querySelector('.lista2t > tbody:nth-child(1) > tr:nth-child(1) > td:nth-child(3)');		// the first cell (the header cell) of the new column
		header.setAttribute('class', 'header6');
		header.setAttribute('align', 'center');
		var dlAnchor = createElement('<a>DL</a>');
		header.addEventListener('click', dlTorrents);
		header.appendChild(dlAnchor);
		addedColumnHeader = true;
	})();

	// the rest cells of the new column
	fixCell(torrentAnchor.nextSibling);

	var oldColumn = torrentAnchor;		// torrent links

	// populate the cells in the new column with DL and ML links
	return(addDlAndMl(oldColumn.nextSibling, oldColumn));
}
function matchSite(siteRegex){
	let result = location.href.match(siteRegex);
	if(result) if(DBG) console.log("Site matched regex: "+siteRegex);
	return result;
}
function loadBigPics(){
	fixCss();
	// Advised not to use as it uses XML requests and will get you banned form the site if you use it for a few pages.
	document.querySelectorAll('.preview-image').forEach(function(e){
		tryBigImage(e);
	});
}

Added thumbnail support for single page torrents (i.e: when a torrent page is opened).