Examine source code of White Kitten

{
  "theme": {
    "images": {
      "theme_frame": "whitekitty.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#174091"
    }
  },
  "version": "2.0",
  "name": "White Kitten",
  "manifest_version": 2,
  "description": "Created using a surexposed photo of a white kitten with blue, blue eyes. He was one of two kittens my cat had last year."
}