Examine source code of Valve Mashup

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#11f0f0"
    }
  },
  "version": "2.0",
  "name": "Valve Mashup",
  "manifest_version": 2,
  "description": "It´s an Mashup.\nI will make more Themes shortly.\nKing Kong VS. Trex: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/2fd9f7e32f717f9e1e28fd715b6afd7f2f950ad2248b003741b464d866912cdb/http%3A//adf.ly/1LWIm6\">http://adf.ly/1LWIm6</a>"
}