Examine source code of Planet and Moon

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#153161",
      "tab_background_text": "#cbe6fa"
    }
  },
  "version": "2.0",
  "name": "Planet and Moon",
  "manifest_version": 2,
  "description": "Feel better with a travel to your new green and quiet planet, under her romantic moon in clouds"
}