Examine source code of Our world

{
  "theme": {
    "images": {
      "theme_frame": "bridgeslim.jpg"
    },
    "colors": {
      "frame": "#ba3500",
      "tab_background_text": "#1f26a6"
    }
  },
  "version": "2.0",
  "name": "Our world",
  "manifest_version": 2
}