Examine source code of Tab Group Manager

{
  "manifest_version": 2,
  "name": "Tab Group Manager",
  "version": "1.0",
  "description": "Create, name, and manage groups of tabs for better organization.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Manage Tab Groups"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cbadf94c-6cda-4a13-8e1f-868e3147987e}"
    }
  }
}