Examine source code of Let the world be

{
  "theme": {
    "images": {
      "theme_frame": "TheWorlddoneperhaps.jpg"
    },
    "colors": {
      "frame": "#357311",
      "tab_background_text": "#323eab"
    }
  },
  "version": "2.0",
  "name": "Let the world be",
  "manifest_version": 2,
  "description": "DA WORLD !"
}