Examine source code of Reddit PGN viewer

{
  "description": "Puts a board in all Reddit pages with PGNs marked by [pgn][/pgn]",
  "manifest_version": 2,
  "name": "Reddit PGN viewer",
  "version": "2.0.3",
  "icons": {
    "128": "knight.png"
  },
  "content_scripts": [
    {
      "css": [
        "css/pgnvjs.css",
        "css/third.css"
      ],
      "js": [
        "pgnvjssettings.js",
        "js/pgnvjs.js",
        "rchesspgn.js"
      ],
      "matches": [
        "*://*.reddit.com/r/*chess*",
        "*://*.reddit.com/r/*Chess*"
      ]
    }
  ],
  "web_accessible_resources": [
    "css/images/*",
    "fonts/*",
    "img/*",
    "locales/*"
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "*://*.reddit.com/r/*chess*",
    "*://*.reddit.com/r/*Chess*",
    "storage"
  ]
}