Add control buttons to tumblr post (Reblog, Edit) Tumblr の個別ポストに「Reblog」「Edit」ボタンを追加します。

tumblr_control.user.js

// ==UserScript==
// @name           Tumblr Control
// @namespace      https://twitter.com/Milly
// @description    Add control buttons to tumblr post (Reblog, Edit)
// @include        http://*.tumblr.com/post/*
// @grant          GM_addStyle
// ==/UserScript==

GM_addStyle([
  '.my-tumblr-control-buttons {',
    'position: absolute;',
    'top: 26px;',
    'right: 2px;',
    'display: block;',
    'white-space: nowrap;',
    'opacity: 0.2;',
    'transition: opacity .5s linear;',
    'z-index: 1000;',
  '}',
  '.my-tumblr-control-buttons:hover {',
    'opacity: 1;',
  '}',
  '.my-tumblr-control-buttons a {',
    'margin: 0 2px 0;',
    'padding: 2px 5px 0;',
    'height: 18px;',
    'display: inline-block;',
    'overflow: hidden;',
    'border-radius: 3px;',
    'background: #777;',
    'color: #fff;',
    'font-size: 8pt;',
    'text-decoration: none;',
    'font-weight: bold;',
    'text-align: center;',
    'line-height: 12pt;',
  '}'
].join(''));

function createLink(label, type, no_rk) {
  var redirect = document.location,
      control = document.getElementById('tumblr_controls').getAttribute('src'),
      pid = control.match(/(?=[?&]pid=([^&]*)).*/)[1],
      rk = control.match(/(?=[?&]rk=([^&]*)).*/)[1],
      base = ['http://www.tumblr.com', type, pid].concat(no_rk ? [] : [rk]),
      url = base.join('/') + '?redirect_to=' + encodeURIComponent(redirect),
      eLink = document.createElement('a');
  eLink.setAttribute('id', 'my-tumblr-control-' + label.toLowerCase());
  eLink.setAttribute('href', url);
  eLink.appendChild( document.createTextNode(label) );
  return eLink;
}

function addControls() {
  var elBody = document.getElementsByTagName('body')[0],
      elLinks = document.createElement('div');
  elLinks.setAttribute('id', 'control_links');
  elLinks.setAttribute('class', 'my-tumblr-control-buttons');
  elLinks.appendChild( createLink('Reblog', 'reblog') );
  elLinks.appendChild( createLink('Edit', 'edit', true) );
  elBody.appendChild(elLinks);
}

addControls();