Examine source code of CaptainFact (Beta)

{
  "version": "1.0.0",
  "name": "CaptainFact",
  "manifest_version": 2,
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvj2HRDAsx3qXl66tfidXZRcQbw7RHG1YwNSgrbFDyvmKL0jP5dpxqD7Y6WpRgUeMYT93sg7hgIt6JHpY3ZOv/HRZII9SYxy6DT4iTkQknQ+5JaJZvnKosvAnU/gRZkwTBDSOnGvc9THirpKtLlEKLsvG8apJWtBzBuCEAuTDpwrapDVu+JM6VPCh+MCWHYfjDd8agbhK6SOPnC81NcqQXOWG3n0/AHTY4g/9PbNwm96f+ymUuFbBYsN4eIzq/wZktf417SnzxMqSIlfdeyTST1xZ74bSCLOi4+XgYI+UaDAQZUNFiZINXojnJrkPo2g3maHqJb+0ZQdggQyS3C9lswIDAQAB",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "extension@captainfact.io"
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "img/icon-16.png",
      "48": "img/icon-48.png",
      "128": "img/icon-128.png"
    },
    "default_title": "CaptainFact",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "img/icon-16.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "web_accessible_resources": [
    "inject.html",
    "img/*.png",
    "img/*.svg"
  ],
  "background": {
    "page": "background.html",
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://captainfact.io/*"
      ],
      "js": [
        "/js/installation_notifier.bundle.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "*://m.youtube.com/*",
    "*://www.youtube.com/*",
    "*://*.captainfact.io/*"
  ],
  "content_security_policy": "default-src 'self'; script-src 'self'; style-src * 'unsafe-inline'; img-src 'self' https://img.youtube.com data:; connect-src 'self' https://*.captainfact.io:*;"
}