Examine source code of Robin Perched

{
  "theme": {
    "images": {
      "theme_frame": "forefoxpersonarobin.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#666666"
    }
  },
  "version": "2.0",
  "name": "Robin Perched",
  "manifest_version": 2,
  "description": "A winter scene of a robin perched on some branches on a pale grey background"
}