Examine source code of firefox christmas world

{
  "theme": {
    "images": {
      "theme_frame": "christmasfirefox2.JPG"
    },
    "colors": {
      "frame": "#424040",
      "tab_background_text": "#424040"
    }
  },
  "version": "2.0",
  "name": "firefox christmas world",
  "manifest_version": 2,
  "description": "firefox Christmas world ,happy holidays everyone its cold out there ! snow everywhere x"
}