Examine source code of Sort tabs advanced 2

{
  "manifest_version": 2,
  "name": "Sort tabs advanced 2",
  "version": "1",
  "author": "Mois Moshev <mois@monomon.me> & Sasith Induwara",
  "icons": {
    "48": "icons/sortabs-48.png"
  },
  "description": "Sort tabs by various criteria",
  "browser_action": {
    "default_icon": {
      "16": "icons/sortabs-16.png",
      "24": "icons/sortabs-24.png",
      "48": "icons/sortabs-48.png"
    },
    "default_title": "Sort tabs advanced 2",
    "default_popup": "popup/picker.html",
    "browser_style": true
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6f02b92-88b3-4aa5-ba7c-14519452171d}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}