Examine source code of World 1

{
  "theme": {
    "images": {
      "theme_frame": "Optimized-worldheader1.png"
    },
    "colors": {
      "frame": "#0077a6",
      "tab_background_text": "#2b2b2b"
    }
  },
  "version": "2.0",
  "name": "World 1",
  "manifest_version": 2
}