Examine source code of Sleeping Kittens

{
  "theme": {
    "images": {
      "theme_frame": "sleepingkittens.jpg"
    },
    "colors": {
      "frame": "#0b03ed",
      "tab_background_text": "#00fbff"
    }
  },
  "version": "2.0",
  "name": "Sleeping Kittens",
  "manifest_version": 2,
  "description": "Cute sleeping kittens"
}