Examine source code of 2FAFast Authenticator

{
  "manifest_version": 3,
  "name": "2FAFast Authenticator",
  "short_name": "2FAFast",
  "version": "1.0.1",
  "description": "Free, offline 2FA authenticator. Unlimited accounts, QR export/import, works with Google Authenticator, Authy, and any TOTP app.",
  "browser_specific_settings": {
    "gecko": {
      "id": "authenticator@2fafast.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "2FAFast Authenticator",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "storage",
    "scripting",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; img-src 'self' data:;"
  }
}