YouTube Sleep Timer

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "YouTube Sleep Timer",
  "description": "Add Sleep Timer to stop YouTube video automatically, letting your computer go to sleep after you.",
  "version": "0.0.1",
  "icons": {
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "permissions": [],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/music-box.mp3"
      ],
      "matches": [
        "<all_urls>"
      ],
      "extension_ids": []
    }
  ],
  "action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  }
}