This script makes the 'Accept HIT' button visible immediately so you can accept the HIT without waiting for the contents of the HIT to finish loading.
// ==UserScript==
// @name mmmturkeybacon Make Accept Button Visible Immediately
// @author mmmturkeybacon
// @description This script makes the 'Accept HIT' button visible immediately so you can accept the HIT without waiting for the contents of the HIT to finish loading.
// @namespace http://userscripts.org/users/523367
// @match https://www.mturk.com/mturk/preview?*
// @require http://code.jquery.com/jquery-latest.min.js
// @version 1.0
// @grant none
// ==/UserScript==
$('input[name="/accept"][src="/media/accept_hit.gif"]:first').parent().parent().css('display', 'block');