Examine source code of Firefox Aurora

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxAuroraH3.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Firefox  Aurora",
  "manifest_version": 2,
  "description": "browser, earth, world, planet, stars, light, sky, browser, purple, Firefox, \n\nGraphic by Firefox, Theme by MaDonna"
}