A simple greasemonkey script to make all text on a website invisible

NoText.user.js

// ==UserScript==
// @name         NoText
// @version      0.2
// @namespace    com.everythinginthesky
// @description  Makes the web bearable
// @author       @rynbtmn
// @match        *://*/*
// ==/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('* { color: rgba(0, 0, 0, 0) !important; text-shadow: none !important; }');
addGlobalStyle('input::-webkit-input-placeholder { color: rgba(0, 0, 0, 0) !important;} input:-moz-placeholder { /* Firefox 18- */color: rgba(0, 0, 0, 0) !important; } input::-moz-placeholder {  /* Firefox 19+ */ color: rgba(0, 0, 0, 0) !important;} input:-ms-input-placeholder { color: rgba(0, 0, 0, 0) !important; } ');