Examine source code of TV Countdown

{
  "manifest_version": 3,
  "name": "TV Countdown",
  "version": "1.96",
  "browser_specific_settings": {
    "gecko": {
      "id": "tvcountdown3122024@fb.com"
    }
  },
  "description": "Notifies you when new TV episodes are about to air.",
  "permissions": [
    "alarms",
    "notifications",
    "storage"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.ico"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}