Examine source code of Hemingway

{
  "theme": {
    "images": {
      "theme_frame": "HemHeader.jpg"
    },
    "colors": {
      "frame": "#222222",
      "tab_background_text": "#222222"
    }
  },
  "version": "2.0",
  "name": "Hemingway",
  "manifest_version": 2,
  "description": "Ernest Hemingway writer for Firefox. Free layout skin. Courtesy of <a href=\"https://outgoing.prod.mozaws.net/v1/1335f69fc4ea9f8ced07fb3526210f953c887ec5038fc4bc942477dd86f0b2cc/http%3A//www.bandini.com.ar/\" rel=\"nofollow\">http://www.bandini.com.ar/</a>"
}