Raw Source
maloomf9 / Remove Dropbox Account Nag 

// ==UserScript==
// @name        Remove Dropbox Account Nag
// @namespace   http://www.furaffinity.net/user/Maloo
// @description Not a good way to make me want an account!
// @include     *dropbox.com/s/*?dl=0*
// @version     1
// @grant       none
// ==/UserScript==

var elem = document.querySelector('#download_button_link');

elem.removeChild(elem.querySelector('script'));

elem.href = window.location.href.replace("?dl=0", "?dl=1");
elem.id = "rabooF";