Examine source code of Quick Doodle

{
  "theme": {
    "images": {
      "theme_frame": "persona-header.png"
    },
    "colors": {
      "frame": "#b8b7a0",
      "tab_background_text": "#d9d162"
    }
  },
  "version": "2.0",
  "name": "Quick Doodle",
  "manifest_version": 2,
  "description": "Quick doodle just to brighten up the search bar."
}