Examine source code of Earth Lights

{
  "theme": {
    "images": {
      "theme_frame": "persona_earth_lights.jpg"
    },
    "colors": {
      "frame": "#000333",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Earth Lights",
  "manifest_version": 2,
  "description": "The entire Earth, at night. This image was created by NASA's Earth Observatory (image is free for re-use or re-publication)."
}