Examine source code of birddog

{
  "theme": {
    "images": {
      "theme_frame": "duffy.JPG"
    },
    "colors": {
      "frame": "#21871f",
      "tab_background_text": "#f7f2f2"
    }
  },
  "version": "2.0",
  "name": "birddog",
  "manifest_version": 2,
  "description": "wirehaired pointing griffon and duck toy"
}