Examine source code of XCOM 2

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "XCOM 2",
  "manifest_version": 2,
  "description": "An XCOM 2 theme.\n\nNever actually expected anyone to download and use this.\n\nIt's a great feeling when you know someone else is using your work.\n\nThanks\n\n:-)"
}