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manifest.json
{
  "manifest_version": 3,
  "name": "Time Zone Viewer",
  "version": "2.0",
  "description": "Display times for three selected time zones based on your system's current time.",
  "permissions": [],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}