Examine source code of Fozzy - Sin and Bones

{
  "theme": {
    "images": {
      "theme_frame": "FozzyPersonaHeader.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#c7cbce"
    }
  },
  "version": "2.0",
  "name": "Fozzy - Sin and Bones",
  "manifest_version": 2,
  "description": "Heavy metal group Fozzy make their Firefox Persona debut, with this awesome design.\n\nFollow me on Twitter: @RussJericho23"
}