Examine source code of RemindMeTask

{
  "manifest_version": 2,
  "name": "task-remainder",
  "version": "2.0",
  "description": "An extension to remind task in the set time",
  "icons": {
    "48": "icons/48-bell.png"
  },
  "permissions": [
    "alarms",
    "activeTab",
    "storage",
    "unlimitedStorage",
    "notifications"
  ],
  "browser_action": {
    "default_icon": "icons/48-bell.png",
    "default_title": "RemindMe",
    "default_popup": "popup/task_remainder.html"
  },
  "background": {
    "scripts": [
      "bg-script.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7bbd697b-690f-4cae-bd7c-c163ac5a0b6b}"
    }
  }
}