Greasy Fork

I want fork this userscript:
IndeXXX - Search - HI-RES Pics
to work with IAFD.

After changing it with the right value... it don't change anything.
How to make this script working?
test link:
https://www.indexxx.com/search/?query=valeria

==UserScript==
// @name IAFD - Search - HI-RES Pics v.1
// @description Higher resolution thumbnails in search results
// @version 1.0
// @author Janvier56
// @namespace https://greasyfork.org/users/7434
// @icon https://external-content.duckduckgo.com/ip3/www.iafd.com.ico
// @include https://www.iafd.com/*
// @license unlicense
// ==/UserScript==


$('.dataTables_wrapper td>a>img').attr('src', function(i, val) {
return val.replace('/graphics/headshots/thumbs/th_', '/graphics/headshots/')
});