Examine source code of Fall in Circles

{
  "theme": {
    "images": {
      "theme_frame": "fall1.jpg"
    },
    "colors": {
      "frame": "#636060",
      "tab_background_text": "#fff7f7"
    }
  },
  "version": "2.0",
  "name": "Fall in Circles",
  "manifest_version": 2,
  "description": "The leaves on my lawn."
}