Examine source code of Calico Kitten

{
  "theme": {
    "images": {
      "theme_frame": "CalicoKitten.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#f2eaea"
    }
  },
  "version": "2.0",
  "name": "Calico Kitten",
  "manifest_version": 2,
  "description": "Thanks to Peter Williams for the use of his beautiful art: <a href=\"https://outgoing.prod.mozaws.net/v1/140bf20e8c5c18d376e69bfaa5bd759d2e734ba747e9b24d40ea973ea7989e8d/http%3A//www.mightyfineart.co.uk/\" rel=\"nofollow\">http://www.mightyfineart.co.uk/</a>\n\ncat, feline, kitty, kitten, stripes, eyes, pet, sweet, lovable, soft, fluffy, black and white, painted, art, artist,"
}