Examine source code of Myrient Folder Size

{
  "manifest_version": 3,
  "name": "Myrient Folder Size",
  "version": "1.0.0",
  "description": "Shows folder sizes on Myrient directory listings.",
  "browser_specific_settings": {
    "gecko": {
      "id": "pixelsworkemail@gmail.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "109.0"
    }
  },
  "permissions": [],
  "host_permissions": [
    "*://myrient.erista.me/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://myrient.erista.me/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  }
}