Examine source code of Auto sort tabs

{
  "manifest_version": 2,
  "name": "Autosort Tabs",
  "version": "3.1.8",
  "description": "sorts Tabs automatically",
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b06f7a31-562f-4013-a21c-a52ba66f859f}"
    }
  }
}