Examine source code of The Caterpillar

{
  "theme": {
    "images": {
      "theme_frame": "whoruheader.jpg"
    },
    "colors": {
      "frame": "#fcfcfc",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "The Caterpillar",
  "manifest_version": 2,
  "description": "Alice in Wonderland, Disney, Caterpillar, Who R U?"
}