fuck.user.js

// ==UserScript==
// @name         My Fancy New Userscript
// @namespace    http://your.homepage/
// @version      0.1
// @description  enter something useful
// @author       You
// @match        https://www.amazon.co.jp/mn/dcw/myx.html*
// @grant        none
// ==/UserScript==
// Generated by CoffeeScript 1.4.0
var down, list, main, one;

console.log("FUCK");

list = localStorage.downlist;

if (!list) {
  list = [];
} else {
  list = JSON.parse(list);
}

one = function(name) {
  document.querySelector('#contentAction_download_myx').click();
  return setTimeout(function() {
    document.querySelector('#dialogButton_ok_myx').click();
    list.push(name);
    localStorage.downlist = JSON.stringify(list);
    return setTimeout(function() {
      return location.reload();
    }, 6000);
  }, 1000);
};

down = function(name) {
  document.querySelector('#contentTabList_0_myx > div > div > div > div > div.a-fixed-left-grid-col.a-col-left > div > div.a-column.a-span7.a-span-last > div > a > span > button').click();
  return setTimeout(function() {
    return one(name);
  }, 1500);
};

main = function() {
  var author, name, title;
  title = jQuery('#title0').text();
  author = jQuery('#author0').text();
  name = "(" + author + ")" + title;
  console.log(name);
  if (list.indexOf(name) === -1) {
    console.log("Download: " + name);
    return down(name);
  } else {
    return setTimeout(function() {
      return location.reload();
    }, 600 * 1000);
  }
};

setTimeout(function() {
  return main();
}, 4000);