Examine source code of YouTube Bookmarker

{
  "manifest_version": 2,
  "name": "YouTube Bookmarker",
  "version": "1.0",
  "description": "Save and organize YouTube videos in categories. Store them in a database and access across browsers anytime, anywhere.",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "notifications",
    "https://www.youtube.com/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src 'self' https://*.firebaseio.com https://*.googleapis.com https://*.firebase.com https://*.firebaseapp.com https://*.cloudfunctions.net https://identitytoolkit.googleapis.com https://*.google.com https://*.gstatic.com https://*.web.app https://*.appspot.com https://securetoken.googleapis.com https://*.firestore.googleapis.com; img-src 'self' https://*.googleapis.com https://*.gstatic.com https://*.google.com https://*.firebase.com https://*.firebaseapp.com https://*.cloudfunctions.net; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; frame-src 'self' https://*.firebaseapp.com https://*.google.com https://*.web.app https://*.appspot.com; worker-src 'self'",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "./dist/background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fb88a3a8-a525-469b-a585-4028bf21e770}"
    }
  }
}