YouTube Volume Control

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "YouTube Volume Control",
  "version": "1.0",
  "manifest_version": 3,
  "description": "Control YouTube video volume with mouse wheel.",
  "icons": {
    "48": "icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "host_permissions": [
    "https://www.youtube.com/*"
  ]
}