Examine source code of Remove Hotstar Watermark

{
  "manifest_version": 2,
  "name": "Remove Hotstar Watermark",
  "version": "1.0",
  "description": "Removes the Hotstar watermark from videos.",
  "icons": {
    "48": "icons/hotstar-logo-cross-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.hotstar.com/*"
      ],
      "js": [
        "remove_hotstar_watermark.js"
      ]
    }
  ]
}