chromium/chrome/test/data/extensions/api_test/font_settings/standard/manifest.json

{
  "name": "Font Settings API Test Extension",
  "version": "0.1",
  "manifest_version": 3,
  "description": "end-to-end browser test for chrome.experimental.fontSettings API",
  "background": {
    "service_worker": "test.js"
  },
  "permissions": ["fontSettings"]
}