Page change monitor with a sound notification

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Page change monitor with a sound notification",
  "version": "1.0.0",
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "externally_connectable": {
    "ids": [
      "*"
    ]
  },
  "description": "Monitors the site for the changes, it is useful for sound notification for MS Teams and others",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "browser_action": {
    "name": "Sort",
    "default_icon": "icon16.png"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "120": "icon120.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "css": [
        "customStyles.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}