Examine source code of Down to Earth

{
  "theme": {
    "images": {
      "theme_frame": "gorezem.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#03fce3"
    }
  },
  "version": "2.0",
  "name": "Down to Earth",
  "manifest_version": 2,
  "description": "Earth, Globe, Map, Europe, America, Asia, Ocean, Sea, Serbia, Srbija, Spain, France, Germany, Austria, Hungary, USA, Canada, Russia, Greece, Croatia, Turkey."
}