Examine source code of bird un pencil

{
  "theme": {
    "images": {
      "theme_frame": "header_polaroidbird.jpg"
    },
    "colors": {
      "frame": "#7fb8cc",
      "tab_background_text": "#1f1a1a"
    }
  },
  "version": "2.0",
  "name": "bird un pencil",
  "manifest_version": 2,
  "description": "a bird in the pencil: what i'm think?"
}