Script to download all images from facebook comments

gistfile1.js

var arr = [];
var imgs = document.querySelectorAll('div.mvs a[ajaxify]');
for (var i = 0; i < imgs.length; i++) { arr.push(imgs[i]); } 
var a = document.createElement('a'); 
var re = RegExp("[?&]src=[^&]+")
arr.forEach(function (img) {
 ajaxify = img.getAttribute('ajaxify'); 
 encoded_img_url = re.exec(ajaxify)[0].substr(5);
 decoded_img_url = decodeURIComponent(encoded_img_url);
 a['href'] = decoded_img_url;
 a['download'] = 'img.png'; 
 a['target'] = '_blank'; 
 document.body.appendChild(a); 
 a.click(); 
 });

Update the query to:
var imgs = document.querySelectorAll('div.mvs a[ajaxify]');