Examine source code of Box turtle

{
  "theme": {
    "images": {
      "theme_frame": "turtlebanner.jpg"
    },
    "colors": {
      "frame": "#595959",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Box turtle",
  "manifest_version": 2,
  "description": "A box turtle. Part of my nature series."
}