Examine source code of Christmas Time at Firefox

{
  "theme": {
    "images": {
      "theme_frame": "xmaspart1.png"
    },
    "colors": {
      "frame": "#3300ff",
      "tab_background_text": "#f7ff00"
    }
  },
  "version": "2.0",
  "name": "Christmas Time at Firefox",
  "manifest_version": 2,
  "description": "Santa's riding through Firefox to wish you a MERRY XMAS! (Be sure to check my blog and FB page for the newest persona designs!)\n\n\n(I did promise a animated persona but the GIF does not work so I'm REALLY SORRY to ALL FX USERS)"
}