Examine source code of earth flat

{
  "theme": {
    "images": {
      "theme_frame": "earth_flat.JPG"
    },
    "colors": {
      "frame": "#828080",
      "tab_background_text": "#828080"
    }
  },
  "version": "2.0",
  "name": "earth flat",
  "manifest_version": 2,
  "description": "earth flat"
}