electron/spec/fixtures/extensions/tabs-api-async/manifest.json

{
  "name": "tabs-api-async",
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [ "<all_urls>"],
      "js": ["main.js"],
      "run_at": "document_start"
    }
  ],
  "background": {
    "service_worker": "background.js"
  },
  "manifest_version": 3
}