Examine source code of Substack Banner Fixer

{
  "manifest_version": 2,
  "name": "Substack Banner Fixer",
  "author": "Russell Chestnut",
  "description": "Prevents the Substack banner from re-appearing when you scroll.",
  "icons": {
    "48": "SS-icon-48.png"
  },
  "version": "1.0.0",
  "content_scripts": [
    {
      "matches": [
        "https://*.substack.com/*"
      ],
      "css": [
        "substackbannerfixer.css"
      ]
    }
  ]
}