Examine source code of Firewatch by slick

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#2b0e2a",
      "tab_background_text": "#fff7f0"
    }
  },
  "version": "2.0",
  "name": "Firewatch by slick",
  "manifest_version": 2,
  "description": "Wallpaper from firewatch game"
}