Examine source code of Der Abend

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#040f01",
      "tab_background_text": "#cad6b8"
    }
  },
  "version": "2.0",
  "name": "Der Abend",
  "manifest_version": 2,
  "description": "Theme based on an oil painting by Caspar David Friedrich (1774-1840), Germany's leading romantic painter of the 19th century. Title \"Der Abend\" means \"The Evening\". View the full painting here: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/c9a42455bb56087102e671b62952af02e222c1562e11a37e91949a2ae216b673/http%3A//images.zeno.org/Kunstwerke/I/big/2000013a.jpg\">http://images.zeno.org/Kunstwerke/I/big/2000013a.jpg</a>"
}