Examine source code of Container Windows

{
  "manifest_version": 3,
  "name": "Container Windows",
  "version": "1.3",
  "author": "JM",
  "description": "Create a single tab group for each window using container tabs.",
  "icons": {
    "48": "tab48.svg",
    "96": "tab48.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{af26cb93-8a9a-4ff8-b209-da523adeb538}",
      "strict_min_version": "148.0"
    }
  },
  "incognito": "not_allowed",
  "action": {
    "default_icon": "tab48.svg",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "contextualIdentities",
    "sessions",
    "storage"
  ]
}