Always Open Privately

Always opens certain websites (configurable list of websites) in a private window. Needs the permission to run in private windows.
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manifest.json
{
  "manifest_version": 2,
  "name": "Always Open Privately",
  "version": "2.0",
  "description": "Always opens certain websites (configurable list of websites) in a private window. Needs the permission to run in private windows.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "applications": {
    "gecko": {
      "id": "openprivately@fbausch.de"
    }
  },
  "permissions": [
    "webNavigation",
    "tabs",
    "activeTab",
    "<all_urls>",
    "storage"
  ],
  "icons": {
    "96": "thumb.png"
  }
}