@eyeo/get-browser-binary/test/extension/mv3/manifest.json

Install browser binaries and matching webdrivers

{
  "name": "Browser test extension - mv3",
  "version": "0.1",
  "manifest_version": 3,
  "background": {
    "service_worker": "background.js"
  },
  "incognito": "split"
}