Examine source code of Private Session Saver

{
  "manifest_version": 2,
  "name": "Private Session Saver",
  "version": "1.0.1",
  "description": "Save URLs from the current Firefox private window and reopen them later in a new private window.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{072c42a9-4e8e-4822-9b6b-54ca1c7f6d5c}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Private Session Saver",
    "default_popup": "popup.html"
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png"
  }
}