Examine source code of format.sexi

{
  "manifest_version": 3,
  "name": "format.sexi",
  "version": "2.5",
  "description": "Formats selected text and copies it to the clipboard.",
  "permissions": [
    "contextMenus",
    "scripting",
    "clipboardWrite",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/format-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0d5fdbb-ca65-4389-af1a-8cde78ae128a}"
    }
  }
}