Examine source code of Tabs Backup & Restore - Extended

{
  "name": "Tabs Backup & Restore - Extended",
  "version": "1.2.8",
  "manifest_version": 2,
  "description": "Never lose your work again! Backup an entire Chrome session (windows and tabs) both manually and automatically at a fixed interval. Drill down into each backup and inspect its contents. Give each milestone backup a descriptive name, and it becomes safe from automatic garbage collection. Restore any combination of windows and/or individual tabs. Grant the extension permission to access incognito windows, and they are fully supported for both backup and restore!",
  "icons": {
    "16": "icon/icon_16.png",
    "48": "icon/icon_48.png",
    "128": "icon/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "options_page": "options.html",
  "browser_action": {
    "default_icon": "icon/icon_48.png",
    "default_title": "Tabs Backup & Restore",
    "default_popup": "popup.html"
  },
  "permissions": [
    "alarms",
    "storage",
    "tabs",
    "unlimitedStorage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "crx-tabs-backup-restore@warren-bank.github.io"
    }
  }
}