Examine source code of OnScreenCars.com Persona

{
  "theme": {
    "images": {
      "theme_frame": "OnScreenCars.comPersonaHeader.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#cccccc"
    }
  },
  "version": "2.0",
  "name": "OnScreenCars.com Persona",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/c95a0697f0b395702c57ca82e3f035258ee539466bc0d9276c92dbd32543d787/http%3A//OnScreenCars.com\" rel=\"nofollow\">OnScreenCars.com</a> fans can now have their own Firefox Persona! Let us know you're using our Persona at <a href=\"https://outgoing.prod.mozaws.net/v1/c95a0697f0b395702c57ca82e3f035258ee539466bc0d9276c92dbd32543d787/http%3A//OnScreenCars.com\" rel=\"nofollow\">OnScreenCars.com</a>"
}