MAL Highlighter.user.js

// ==UserScript==
// @name        MAL Highlighter
// @namespace   drillbit.notinept.me
// @description Highlights MAL shows.
// @include     http://myanimelist.net/*
// @include     https://myanimelist.net/*
// @version     1
// @grant       none
// ==/UserScript==

var getUserTitles = function(user) {
  //request user list
  var url = "http://myanimelist.net/malappinfo.php?status=all&u=" + user;
  var xmlHttp = null;
  xmlHttp = new XMLHttpRequest();
  xmlHttp.open( "GET", url, false );
  xmlHttp.send( null );
  //console.log(xmlHttp.responseText);
  xml = xmlHttp.responseText;
  //parse xml to javascript object
  titles = {};

  anchor = "<anime>";
  for (var i = xml.indexOf(anchor); i >= 0; i = xml.indexOf(anchor, i + 1)) {
    //console.log(xml.substring(i+65,i+75));
    title = xml.substring(xml.indexOf("<series_title>",i)+14, xml.indexOf("</series_title>",i));
    status = xml.substring(xml.indexOf("<my_status>",i)+11, xml.indexOf("</my_status>",i));
    // 1/watching, 2/completed, 3/onhold, 4/dropped, 6/plantowatch
    score = xml.substring(xml.indexOf("<my_score>",i)+10, xml.indexOf("</my_score>",i));

    titles[title] = { "title" : title, "status" : status, "score" : score };
  }
  return titles;
}

var user = document.getElementsByClassName('profile-name')[0].innerHTML;
var titles = getUserTitles(user);

var onPage = document.getElementsByTagName('tbody')[0].children;
for (var i = 0; i < onPage.length; ++i) {
  var text = onPage[i].innerHTML;
  if (text) {
    title = text.substring(text.indexOf("<strong>")+8, text.indexOf("</strong>"));
    if (titles[title]) {
      var status = titles[title]['status'];
      color = "rgba(0,150,150,.4)"; // plantowatch/dropped/onhold
      if (status == 1) { color = "rgba(0,0,200,.4)"; } //watching
      else if (status == 2) { color = "rgba(0,200,0,.4)"; } //watched
      onPage[i].style.backgroundColor = color;
    }
  }

}