Examine source code of 2! Authenticator

{
  "name": "2! Authenticator",
  "description": "The private, offline 2FA Authenticator. Import accounts from mobile apps and generate TOTP codes securely",
  "version": "2.0.6",
  "manifest_version": 3,
  "icons": {
    "128": "/icons/icon128.png"
  },
  "action": {
    "default_title": "2! Authenticator",
    "default_popup": "index.html",
    "default_icon": {
      "32": "/icons/icon32.png",
      "48": "/icons/icon48.png",
      "64": "/icons/icon64.png",
      "96": "/icons/icon96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://extensionpay.com/*"
      ],
      "js": [
        "js/ExtPay-nomod.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "scripting",
    "clipboardRead"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'; worker-src 'self';"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "140.0",
      "id": "@2-authenticator.v2.flytesoft-org",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  }
}