Examine source code of Ala 13

{
  "theme": {
    "images": {
      "theme_frame": "firefox_persona_ala13.png"
    },
    "colors": {
      "frame": "#999999",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Ala 13",
  "manifest_version": 2,
  "description": "Grupo de vuelo virtual Ala 13 - <a href=\"https://outgoing.prod.mozaws.net/v1/0769da7028cd5a87a3a4465058a6973dd1270c9d2e8c7d3380d10d40820ffbae/http%3A//www.ala13.com\" rel=\"nofollow\">www.ala13.com</a>"
}