Dribbble @2x replacer: change @1x to @2x.

dribbble-2x-replacer.js

// ==UserScript==
// @name		Dribbble 2x
// @namespace	http://vancura.org
// @description	Use 2x images
// @homepage	http://vancura.org
// @version		0.0.1
// @require		http://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js
// @include		*://dribbble.com/*

// ==/UserScript==

var f;
var src, fn, ext;
var loop = setInterval(dribbbleLoop, 1000);

function dribbbleLoop() {
    $(".dribbble-img img").each(function() {
        t = $(this);
        src = t.attr("src");

        if(src.indexOf('_1x.') > 0) {
            fn = src.substr(0, src.length - 7);
            ext = src.substr(src.length - 3, 3);
            src = fn + "." + ext;

            t.after("<img src='" + src + "' />");
            t.hide();
        }
    });
}