Examine source code of Tunnelers theme

{
  "theme": {
    "images": {
      "theme_frame": "tunnelers.jpg"
    },
    "colors": {
      "frame": "#262626",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Tunnelers theme",
  "manifest_version": 2,
  "description": "Tunnelers persona from the videogame Tunnelers. Made with Logomotion.\n<a href=\"https://outgoing.prod.mozaws.net/v1/7dc0bf73a2429a35f497ce153f86e216a5edb47e837ffd439173a37ef75dd917/http%3A//www.tunnelers.com\" rel=\"nofollow\">www.tunnelers.com</a>\nBy Dr_Jellyface"
}