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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "description": "A chrome extension",
  "version": "0.0.8",
  "name": "Create React App Sample",
  "permissions": [
    "activeTab",
    "idle",
    "tabs"
  ],
  "background": {
    "service_worker": "./static/js/background.js"
  },
  "action": {}
}