Examine source code of Better Infinite Craft

{
  "manifest_version": 3,
  "icons": {
    "16": "icons/icon-16x16.png",
    "48": "icons/icon-48x48.png",
    "128": "icons/icon-128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://neal.fun/infinite-craft/*"
      ],
      "run_at": "document_start",
      "css": [
        "assets/content.css"
      ],
      "js": [
        "better-infinite-craft-content.js"
      ]
    }
  ],
  "name": "Better Infinite Craft",
  "short_name": "Better Infinite Craft",
  "description": "Extra features for Infinite Craft on neal.fun",
  "version": "1.2.0",
  "action": {
    "default_title": "Better Infinite Craft"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "better-infinite-craft@neal.fun"
    }
  }
}