Userscripts.org

// ==UserScript==
// @name            Tag Buttons
// @namespace       http://www.kuribo.info/
// @author          kuribo
// @include         http://www.blogger.com/comment.g?*
// @description     Tag Buttons
// ==/UserScript==

(function() {
  var s = document.createElement("script");
  s.charset="UTF-8";
  s.src = "http://tools.kuribo.info/tagbutton/tagbutton.js";
  document.body.appendChild(s)
})();