Examine source code of My Notification (alarm)

{
  "description": "Notify yourself of important events",
  "version": "1.0.2",
  "manifest_version": 2,
  "default_locale": "en",
  "name": "My Notification",
  "background": {
    "scripts": [
      "background.bundle.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "My Notification",
    "default_icon": "icon-34.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icon-128.png"
  },
  "permissions": [
    "background"
  ]
}