Examine source code of Reclaim Vertical Space

{
  "manifest_version": 2,
  "name": "Reclaim Vertical Space",
  "version": "1.0",
  "description": "No more sticky menus, footers, and cookie banners.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "vertical.js"
      ]
    }
  ]
}