Examine source code of Bird and Lightning

{
  "theme": {
    "images": {
      "theme_frame": "Lighteningtop.jpg"
    },
    "colors": {
      "frame": "#f7f4f4",
      "tab_background_text": "#f7f4f4"
    }
  },
  "version": "2.0",
  "name": "Bird and Lightning",
  "manifest_version": 2,
  "description": "Bird flying through a lightning storm over the sea at night.\nMoody and atmospheric."
}