Examine source code of LC Contest Helper

{
  "manifest_version": 2,
  "name": "LC HELPER",
  "version": "1.1",
  "description": "Utilities for a better contest experience!",
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "https://*.leetcode.com/*"
  ],
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "https://*.leetcode.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{449eb63b-5b47-4579-9f92-d9b3fd5a6a65}"
    }
  }
}