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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Save to Google Calendar",
  "version": "2.0",
  "manifest_version": 3,
  "description": "Send selected date on a webpage to Google Calendar",
  "background": {
    "service_worker": "eventPage.js"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "contextMenus"
  ]
}