Examine source code of Firewatch theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#630723",
      "tab_background_text": "#f0bba6"
    }
  },
  "version": "2.0",
  "name": "Firewatch theme",
  "manifest_version": 2,
  "description": "All rights reserved to Campo Santo. I didn't make this artwork. I just wanted to use it as a theme because it looks cool."
}