Examine source code of Little 1 2 3

{
  "theme": {
    "images": {
      "theme_frame": "bovenkantlittle.jpg"
    },
    "colors": {
      "frame": "#18f034",
      "tab_background_text": "#18f034"
    }
  },
  "version": "2.0",
  "name": "Little 1 2 3",
  "manifest_version": 2,
  "description": "klein, kind, child, beer, vogel, bird.glinstering,bear"
}