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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Capital Crunch",
  "version": "1.0",
  "description": "Test Your Knowledge on World Capitals!",
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "alarms",
    "storage"
  ],
  "action": {
    "default_popup": "options.html"
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  }
}