Raw Source
yaelmania / Yotube Image Acces 

// ==UserScript==
// @name                Yotube Image Acces
// @namespace           https://openuserjs.org/users/yaelmania
// @run-at              document-end
// @require             https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
// @include             https://www.youtube.com/*
// @include             http://www.youtube.com/*
// @version             0.9
// @description         YouTube image access | This script allows you to access the video images in different resolutions. | Sometimes there is video though it not be worth it to see them images that you like and you want to download it. | the solution is here, just install this script and links will appear in the description of the images. | Note: some occasions used in conjunction with other script does not display links to the first time, only you must reload the page and it will appear.
// @author              yaelmania
// @copyright           yaelmania Ilutions Graphics
// @homepageURL         http://www.yaelmania.co.nf
// @@supportURL         yaelmania@latinmail.com
// @grant               unsafeWindow
// ==/UserScript==

var $yj = jQuery.noConflict();

$yj(document).ready(function() {
  var ETIQUETA_TEXTO={'ar':'صورة الفيديو','cs':'Obraz videa','de':'Video-Bild','en':'Video image','es':'Video imagen','fr':'Image vidéo','hi':'डवीडियो छवि','hu':'Videokép','id':'Gambar video','it':'Immagine video','ja':'ビデオ画像','ko':'비디오 이미지','pl':'Obraz wideo','pt':'Imagem de vídeo','ro':'Imagine video','ru':'Видео изображение','tr':'Video görüntüsü','zh':'视频图像'};
  var idiomas=document.documentElement.getAttribute('lang');
  var imagenImg = 'data:image/gif;base64,R0lGODlhCAAMAJEBAAAzmQAAAAAAAAAAACH5BAEAAAEALAAAAAAIAAwAAAIPjI+puwDqXorQIXpwliwUADs=';
  var imageText=(ETIQUETA_TEXTO[idiomas])?ETIQUETA_TEXTO[idiomas]:ETIQUETA_TEXTO['en'];
  var videoid = window.location.href;
  var filtroA = videoid.replace(/.+v=/gi,'');
  var filtroB = filtroA.replace(/&.+/gi,'');
  var newimgBox = document.createElement('li');
  newimgBox.setAttribute('id','ImgBox');
  newimgBox.setAttribute('class','watch-meta-item');
  newimgBox.innerHTML = ".";
  $yj('.watch-extras-section')[0].appendChild(newimgBox);
  $yj('#ImgBox').html('<h4 class="title">' + imageText + '</h4><ul class="content watch-info-tag-list"><a class="yt-uix-sessionlink spf-link g-hovercard" href="https://i.ytimg.com/vi/' + filtroB + '/hqdefault.jpg" target="_blank"><img src="' + imagenImg + '"/>HQ Imagen</a> <a class="yt-uix-sessionlink spf-link g-hovercard" href="https://i.ytimg.com/vi/' + filtroB + '/mqdefault.jpg" target="_blank"><img src="' + imagenImg + '"/>MQ Imagen</a> <a class="yt-uix-sessionlink spf-link g-hovercard" href="https://i.ytimg.com/vi/' + filtroB + '/default.jpg" target="_blank"><img src="' + imagenImg + '"/>Low Imagen</a></ul>');
});