Examine source code of HackerRank Footer Fixer

{
  "name": "HackerRank Footer Fixer",
  "short_name": "HRW Footer",
  "description": "Changes the styling for fixed footer in HackerRank For Work Pages ✨",
  "author": "Ishan Sharma @ishandeveloper",
  "version": "1.1",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [
        "https://www.hackerrank.com/work*"
      ],
      "js": [
        "footer.js"
      ]
    }
  ],
  "icons": {
    "192": "icons/icon-192x192.png",
    "256": "icons/icon-256x256.png",
    "384": "icons/icon-384x384.png",
    "512": "icons/icon-512x512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a376db36-224c-4726-8f03-dd60d767353c}"
    }
  }
}