Examine source code of Scribbles

{
  "theme": {
    "images": {
      "theme_frame": "scribblestyleheader.png"
    },
    "colors": {
      "frame": "#707070",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Scribbles",
  "manifest_version": 2,
  "description": "Cute little scribbles, including a boy with a 'Mozilla' shirt."
}