Examine source code of Medium Paywall Redirector

{
  "manifest_version": 2,
  "name": "Medium Paywall Redirector",
  "version": "1.0",
  "description": "Redirects premium Medium articles to another website",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{976b505f-d7ec-470f-bbab-f324b9d4e1c2}"
    }
  }
}