Examine source code of Exam Countdown

{
  "manifest_version": 3,
  "name": "Exam Countdown",
  "version": "1.0.2",
  "description": "A clean, distraction-free new tab dashboard for students showing exam countdowns, a to-do list, and study motivation.",
  "action": {
    "default_title": "Open Exam Countdown"
  },
  "background": {
    "service_worker": "js/background.js",
    "scripts": [
      "js/background.js"
    ],
    "type": "module"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "exam-countdown@attendcalc.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}