Examine source code of Doctor Moon

{
  "theme": {
    "images": {
      "theme_frame": "moon.jpg"
    },
    "colors": {
      "frame": "#fffcfc",
      "tab_background_text": "#fffcfc"
    }
  },
  "version": "2.0",
  "name": "Doctor Moon",
  "manifest_version": 2,
  "description": "The Doctor standing in front of a moon"
}