Examine source code of Black Adder

{
  "theme": {
    "images": {
      "theme_frame": "BLACKADDER.jpg"
    },
    "colors": {
      "frame": "#0f1d40",
      "tab_background_text": "#080808"
    }
  },
  "version": "2.0",
  "name": "Black Adder",
  "manifest_version": 2,
  "description": "The Black-Adder, BBC TV 1983-1989"
}