Examine source code of The Asylumantics

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#d4d4d4",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "The Asylumantics",
  "manifest_version": 2,
  "description": "The Wrenwood gang is loose and is now invading your browser!  This official Asylumanticsâ„¢ persona is a great way to dress up Firefox with characters from the popular webcomic!"
}