Examine source code of The Silver Chicken

{
  "theme": {
    "images": {
      "theme_frame": "Silver-Chicken-header.jpg"
    },
    "colors": {
      "frame": "#696767",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "The Silver Chicken",
  "manifest_version": 2,
  "description": "The CAP-21DS I-SIVM \"The Silver Chicken\", an airplane which made the history of aerobatic flight.\nStill alive and kicking!"
}