Examine source code of Tab Exporter/Importer

{
  "manifest_version": 3,
  "name": "Tab Exporter/Importer",
  "version": "1.0",
  "description": "Exports all open tabs to a text file and imports them again.",
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "tabs",
    "downloads"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-exporter-importer@martingawron.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}