Examine source code of Smart Tab Groups Enhanced

{
  "manifest_version": 3,
  "name": "Smart Tab Groups Enhanced",
  "version": "1.0",
  "description": "Automatically groups tabs opened from an existing tab that isn't pinned.",
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "sessions",
    "tabs",
    "tabGroups"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0bfc4be2-4e0f-4e98-9731-3f879768eb9f}"
    }
  }
}