Examine source code of ZyBooks Auto

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "ZyBooks Auto",
  "version": "1.0",
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "zybooksautofirefox@dalmiz"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://learn.zybooks.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icon.png"
  }
}