So the last will be first

so_the_last_will_be_first.js

// ==UserScript==
// @name        so the last will be first
// @namespace   http://www.zedlopez.org/
// @description commentator
// @include     http://*.metafilter.com/*
// @version     1
// @grant       none
// ==/UserScript==

(function so_the_last_will_be_first() {
if (document.URL.match(/((www|ask|fanfare|projects|music|podcast|irl|metatalk)\.)?metafilter.com\/[1-9]/)) {
  var flag, fav, idstring;
  var comments = document.getElementsByClassName('comments');
  for (var i=0, comment; comment = comments[i++];) {
    var smallcopies = comment.getElementsByClassName('smallcopy');
    if (smallcopies.length !== 1) { continue; }
    var smallcopy = smallcopies[0];
    var subspans = smallcopy.getElementsByTagName('span');
    for (var j=0,subspan;subspan = subspans[j++];) {
      var id = subspan.getAttribute('id');
      if (id === null) { continue; }
      if (idstring = id.match(/^fav(\d+)$/)) {
        fav = smallcopy.removeChild(subspan);
        break;
      }
    }
    if (comment.classList.contains("best")) {
      smallcopy.appendChild(document.createTextNode("[marked as best answer]"));
    }
    smallcopy.removeChild(smallcopy.firstChild); // posted by
    flag = document.getElementById("flag"+idstring[1]);
    if (flag !== null) { smallcopy.removeChild(flag); }
    comment.insertBefore(document.createElement('br'),comment.firstChild);
    comment.insertBefore(smallcopy, comment.firstChild);
    //comment.insertBefore(document.createElement('hr'),comment.firstChild);
    var trailer = document.createElement('small');
    trailer.appendChild(fav);
    if (flag !== null) { trailer.appendChild(flag); }
    trailer.appendChild(document.createElement('hr'));
    comment.appendChild(trailer);
  }
}
})();