Examine source code of Orbiting Planets

{
  "theme": {
    "images": {
      "theme_frame": "header71.jpg"
    },
    "colors": {
      "frame": "#e3e0e0",
      "tab_background_text": "#f7f459"
    }
  },
  "version": "2.0",
  "name": "Orbiting Planets",
  "manifest_version": 2,
  "description": "Planets in orbit around the sun."
}