Examine source code of Coding Competition Alerts

{
  "name": "Contest Reminder – Coding Competition Alerts",
  "version": "2.8.1",
  "description": "Track LeetCode, Codeforces & more. Sync to Calendar, Daily Challenge reminders & streaks. The ultimate coding companion.",
  "homepage_url": "https://www.contestclocker.com/",
  "permissions": [
    "storage",
    "alarms",
    "notifications",
    "identity"
  ],
  "host_permissions": [
    "https://www.codechef.com/*",
    "https://atcoder.jp/*",
    "https://www.hackerrank.com/*",
    "https://api.topcoder.com/*",
    "https://practiceapi.geeksforgeeks.org/*",
    "https://www.googleapis.com/*",
    "https://accounts.google.com/*",
    "https://leetcode.com/*",
    "https://www.reddit.com/*"
  ],
  "oauth2": {
    "client_id": "83373117108-9p424rl6oka3l3nut9odekcjgqe1pe8v.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/calendar.events",
      "https://www.googleapis.com/auth/userinfo.email"
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "coding_contest_reminder@contestclocker.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/get_started16.png",
      "32": "images/get_started32.png",
      "48": "images/get_started48.png",
      "128": "images/get_started128.png"
    }
  },
  "icons": {
    "16": "images/get_started16.png",
    "32": "images/get_started32.png",
    "48": "images/get_started48.png",
    "128": "images/get_started128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "manifest_version": 3
}