Examine source code of Squirrel Crossing

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#331e13",
      "tab_background_text": "#c9c9c9"
    }
  },
  "version": "2.0",
  "name": "Squirrel Crossing",
  "manifest_version": 2,
  "description": "Always look both ways before crossing the street."
}