Days Until Halloween

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Days Until Halloween",
  "description": "Displays the number of days until Halloweeen",
  "version": "0.2",
  "icons": {
    "128": "daysUntilHalloween128.png"
  },
  "background": {
    "service_worker": "background.js"
  },
  "action": {
    "default_icon": "daysUntilHalloweenDefault.png",
    "default_popup": "./popup.html"
  }
}