Examine source code of Closest Body

{
  "theme": {
    "images": {
      "theme_frame": "moonhead.JPG"
    },
    "colors": {
      "frame": "#701694",
      "tab_background_text": "#0cedcf"
    }
  },
  "version": "2.0",
  "name": "Closest Body",
  "manifest_version": 2,
  "description": "A collection of moon photos."
}