Examine source code of Schedule Planner Web

{
  "manifest_version": 2,
  "name": "Schedule Planner",
  "version": "1.0",
  "description": "A simple schedule planner with reminders, drag-and-drop, and sync.",
  "permissions": [
    "storage",
    "notifications"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dbd4eecd-3ca1-4d0b-80b7-59dc680bd510}"
    }
  }
}