Examine source code of Medium Custom Style

{
  "manifest_version": 3,
  "name": "Medium Custom Style",
  "version": "1.1",
  "description": "Overrides specific CSS classes on Medium",
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "*://medium.com/*",
    "*://*.medium.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://medium.com/*",
        "*://*.medium.com/*"
      ],
      "css": [
        "./styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "anjitcoder@gmail.com",
      "strict_min_version": "109.0"
    }
  }
}