chromium/chrome/test/data/extensions/api_test/user_scripts/injection_order/manifest.json

{
  "name": "Injection Order Test",
  "version": "0.1",
  "manifest_version": 3,
  "permissions": ["userScripts", "tabs"],
  "host_permissions": ["http://example.com/*"],
  "background": {
    "service_worker": "background.js",
    "type": "module"
  }
}