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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1",
  "name": "Penguins",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "description": "Penguins are the best swimmers of all birds, able to travel at speeds of up to 6 mph.",
  "manifest_version": 3
}