Examine source code of Firestarter

{
  "theme": {
    "images": {
      "theme_frame": "persona.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#787878"
    }
  },
  "version": "2.0",
  "name": "Firestarter",
  "manifest_version": 2,
  "description": "Here is matching background\n\n<a href=\"https://outgoing.prod.mozaws.net/v1/978c43a1d2a719e1dfe03a5282fef92e9f3584234a2d5c9e526a01d157acd26b/http%3A//d67.deviantart.com/art/Win-7-Fire-Background-203466146\" rel=\"nofollow\">http://d67.deviantart.com/art/Win-7-Fire-Background-203466146</a>"
}