Examine source code of Reminder

{
  "manifest_version": 2,
  "name": "Reminder",
  "description": "This is a Reminder",
  "version": "3.1",
  "background": {
    "scripts": [
      "scripts.js",
      "main.js"
    ]
  },
  "icons": {
    "48": "alarm.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "alarm.png"
    },
    "default_popup": "index.html",
    "default_title": "Reminder"
  },
  "permissions": [
    "notifications",
    "activeTab",
    "alarms"
  ]
}