Examine source code of LAN File Transfer

{
  "manifest_version": 3,
  "name": "LAN File Transfer",
  "description": "Transfer files up to 1GB directly between browsers on the same local network.",
  "version": "1.0.0",
  "action": {
    "default_title": "LAN File Transfer",
    "default_popup": "popup.html"
  },
  "permissions": [],
  "host_permissions": [
    "https://ntfy.sh/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "lan-file-transfer@gemini.cli",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "personalCommunications"
        ]
      }
    }
  }
}