Examine source code of Leetcode Helper

{
  "manifest_version": 2,
  "name": "Leetcode Helper",
  "version": "2.1",
  "description": "Helper extension to solve Leetcode",
  "browser_action": {
    "default_icon": "icons/leetcode-helper-icon-48.svg",
    "default_title": "Leetcode Helper",
    "default_popup": "index.html"
  },
  "icons": {
    "48": "icons/leetcode-helper-icon-48.svg",
    "96": "icons/leetcode-helper-icon-96.svg"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://leetcode.com/problems/*"
      ],
      "js": [
        "libs/browser-polyfill.min.js",
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false,
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6428dce-fb3e-42cf-a36e-7ad7143a69c3}"
    }
  }
}