Examine source code of google calendar duplicate event

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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_appName__",
  "version": "4",
  "description": "__MSG_shortDesc__",
  "manifest_version": 3,
  "default_locale": "en",
  "icons": {
    "16": "images/duplicate16.png",
    "48": "images/duplicate48.png",
    "64": "images/duplicate64.png",
    "128": "images/duplicate128.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "images/duplicate16.png",
      "48": "images/duplicate48.png",
      "64": "images/duplicate64.png",
      "128": "images/duplicate128.png"
    }
  },
  "background": {
    "service_worker": "./static/js/background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "https://calendar.google.com/calendar/*"
      ],
      "js": [
        "./static/js/contentScript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "storage",
    "webNavigation",
    "activeTab",
    "scripting",
    "tabs"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "static/js/contentScript.js",
        "images/duplicate16.png",
        "images/duplicate48.png",
        "images/duplicate64.png",
        "images/duplicate128.png",
        "images/rating_star.png",
        "images/click_duplicate.png",
        "images/click_event.png",
        "images/rocket.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}