var downloadUrl = 'https://vipergirls.to/threads/3296103-Amateur-big-boobs-hot-girls-photos/page2';
var images = document.getElementsByTagName('img');
for (i=0; i < images.length; i++) {
	var origSrc = images[i].src;
  var repSrc = origSrc.replace('/t/', '/i/')
	images[i].src = repSrc;
}