Examine source code of Mitten

{
  "theme": {
    "images": {
      "theme_frame": "headerrunners.jpg"
    },
    "colors": {
      "frame": "#bac",
      "tab_background_text": "#eaeaf7"
    }
  },
  "version": "2.0",
  "name": "Mitten",
  "manifest_version": 2,
  "description": "Running"
}