chromium/chrome/test/data/extensions/api_test/web_authentication_proxy/main/manifest.json

{
  "name": "Web Authentication Proxy API Test",
  "manifest_version": 3,
  "version": "0.1",
  "background": {
    "service_worker": "test.js",
    "type": "module"
  },
  "permissions": [
    "webAuthenticationProxy"
  ]
}