Examine source code of Chibi Jack

{
  "theme": {
    "images": {
      "theme_frame": "firefox_jack.jpg"
    },
    "colors": {
      "frame": "#1e3d63",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Chibi Jack",
  "manifest_version": 2,
  "description": "Cute firefox persona of a chibi version of Jack."
}