Examine source code of Firewatch Dark Landscape

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffede3"
    }
  },
  "version": "2.0",
  "name": "Firewatch Dark Landscape",
  "manifest_version": 2,
  "description": "A theme based on Firewatch, an indie game by CampoSanto:\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/5265015fedf5488384276c7b790caa6c3cc549c5add4038c928d0a2dc5dbc807/http%3A//www.firewatchgame.com/\">http://www.firewatchgame.com/</a>"
}