Examine source code of GoTodo - Task Management

{
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon-16x16.png",
    "48": "icons/icon-48x48.png",
    "128": "icons/icon-128x128.png",
    "256": "icons/icon-256x256.png",
    "512": "icons/icon-512x512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage",
    "notifications"
  ],
  "web_accessible_resources": [
    "*",
    "<all_urls>"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "name": "GoTodo™ - Todo list, Notes & Reminders",
  "short_name": "GoTodo",
  "description": "GoTodo is your productivity app to organize work & life with simple yet powerful todo list, tasks, reminders, notes, checklists.",
  "browser_action": {
    "default_title": "GoTodo",
    "default_popup": "assets/popup.html"
  },
  "version": "3.1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3bc111c-6e83-4596-91dc-de866d7d7b5c}"
    }
  }
}