Examine source code of f.ds extension

{
  "content_scripts": [
    {
      "css": [
        "links.css"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "purify.min.js",
        "links.js"
      ],
      "matches": [
        "*://forum.dominionstrategy.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "jquery-3.3.1.min.js",
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "32": "FDS-32.png",
    "48": "FDS-48.png",
    "64": "FDS-64.png",
    "126": "FDS-16.png",
    "128": "FDS-128.png"
  },
  "description": "Enhances f.ds poster experience",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAofyNDVlbt4B7d1CcGkxj1XAiMV4LtIsObqeqzeBLLueU97puvySJSG0WK8Qv5afmmBasSYzeScYQrVyAENphHS+oQfVz1ViYD0FPt2O+nDmhIwN2mW1854gYHWFgbIxg+28poTpqo2hENoxESEeqPQJwItPbF9Fm2v+8/T2Bc/oCykehGHyt27IiU6TcWD0gntWK6XWCvfvOHeFx2GRNHBvTeCfJ4ANWWS/OKPN+JfFLBZMvNxix+DiVv5WivoTUV6ITcCjYNcoO7bM/Z7Tp6eW/M5J0VGAw8/hLJdwFIKgFQ6eo95pav9WyXxqM3TDDYs1EE67PYvTLX21dto023wIDAQAB",
  "manifest_version": 2,
  "name": "f.ds extension",
  "permissions": [
    "*://forum.dominionstrategy.com/*",
    "http://pittersplace.com/*",
    "storage"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.36",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a06b70af-bcc7-45b5-9940-24e154f6810b}"
    }
  }
}