Examine source code of 2FA Live

{
  "manifest_version": 3,
  "name": "2FA Live",
  "version": "0.1.0",
  "description": "Show live TOTP 2FA codes instantly from a user-provided secret.",
  "icons": {
    "128": "icons/avatar.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_title": "2FA Live"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "2fa-live@local",
      "strict_min_version": "140.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}