Examine source code of WordPress Vintage Press

{
  "theme": {
    "images": {
      "theme_frame": "stepunk_final.jpg"
    },
    "colors": {
      "frame": "#66cccc",
      "tab_background_text": "#000033"
    }
  },
  "version": "2.0",
  "name": "WordPress Vintage Press",
  "manifest_version": 2,
  "description": "Inspired by the style of the great old-time printing presses, designer Chad Pugh created this WordPress-themed Persona for Firefox."
}