Examine source code of Flash Kit

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_fk.jpg"
    },
    "colors": {
      "frame": "#0f16db",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Flash Kit",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/b562d1ef3161f9753626a021ffe929ed9ee8c63bdc5e6892ef78c4b4f798cacc/http%3A//FlashKit.com\" rel=\"nofollow\">FlashKit.com</a> Persona"
}