webkit version

kurukuruimg.user.js

// ==UserScript==
// @name           kurukuruimg
// @namespace      http://www.hatena.ne.jp/hitode909
// @include        *
// ==/UserScript==

var style = document.createElement('style');
document.body.appendChild(style);
style.textContent = "img, canvas, video {\n" + "-webkit-transform: rotate(0deg);\n" + "  }";

var deg = 0;
var diff = 0;

setInterval(function() {
    deg += diff;
    diff++;
    style.sheet.cssRules[0].style.WebkitTransform = 'rotate(' + deg % 360 + 'deg)';
}, 0);