Real World Haskell comments remover

gistfile1.js

// ==UserScript==
// @name          Real World Haskell comments remover
// @namespace     http://sergejx.mysteria.cz/
// @description   Remove links to comments from Real World Haskell online book.
// @include       http://book.realworldhaskell.org/read/*
// ==/UserScript==

function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

addGlobalStyle('.commenttoggle { display: none !important; }');