Examine source code of Tab Exporter

{
  "manifest_version": 3,
  "name": "Tab Exporter",
  "version": "2.0.0",
  "description": "Export open tabs in multiple formats.",
  "permissions": [
    "tabs",
    "downloads"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Export Tabs",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-exporter@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}