Resizes tab characters to 2 spaces (currently only works in FF4 and Opera 10.60)

tab-size.user.js

// ==UserScript==
// @match http://*/*
// @match https://*/*
// ==/UserScript==

var style = document.createElement('style');
style.textContent = [
  'pre {                 ',
  '  -webkit-tab-size: 2;',
  '     -moz-tab-size: 2;',
  '       -o-tab-size: 2;',
  '          tab-size: 2;',
  '}                     '
].join('');
document.getElementsByTagName('head')[0].appendChild(style);