Examine source code of fireworks2010

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#1d2538"
    }
  },
  "version": "2.0",
  "name": "fireworks2010",
  "manifest_version": 2,
  "description": "Fireworks blast on a Fourth of July in Clearwater, Florida, 2010"
}