Examine source code of Deep Starry Sky

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxBanner.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#1ee3e6"
    }
  },
  "version": "2.0",
  "name": "Deep Starry Sky",
  "manifest_version": 2,
  "description": "A starry scene created in Photoshop CS4."
}