Examine source code of Private Tabs

{
  "manifest_version": 2,
  "name": "Private Tabs",
  "version": "1.3.2",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "private-tabs@typeling1578",
      "strict_min_version": "115.0"
    }
  },
  "icons": {
    "48": "icons/icon-48x48.png",
    "96": "icons/icon-96x96.png"
  },
  "permissions": [
    "contextualIdentities",
    "cookies",
    "menus",
    "storage",
    "tabs",
    "webNavigation",
    "history"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-newtab-48x48.png",
      "96": "icons/icon-newtab-96x96.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}