Examine source code of Jumpin Fireballs

{
  "theme": {
    "images": {
      "theme_frame": "bac.jpg"
    },
    "colors": {
      "frame": "#fcf9f9",
      "tab_background_text": "#faf7f7"
    }
  },
  "version": "2.0",
  "name": "Jumpin Fireballs",
  "manifest_version": 2,
  "description": "Looks sort like the jumpin fireballs from Mario."
}