500px.user.js

// ==UserScript==
// @name         Enable right click on 500px.com
// @namespace    jQueryForChromeExample
// @include      *
// @author       Max Ulidtko
// @description  Disables the blocker of right clicking on 500px images
// ==/UserScript==

// a function that loads jQuery and calls a callback function when jQuery has finished loading
function addJQuery(callback) {
  var script = document.createElement("script");
  script.setAttribute("src", "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js");
  script.addEventListener('load', function() {
    var script = document.createElement("script");
    script.textContent = "(" + callback.toString() + ")();";
    document.body.appendChild(script);
  }, false);
  document.body.appendChild(script);
}

// the guts of this userscript
function main() {
  jQuery("div#photo a, .darkbox, .darkbox img, .post_entry_photo img, .post_entry_div_img img").die();
}

// load jQuery and execute the main function
addJQuery(main);