Examine source code of Private Window Vanisher

{
  "manifest_version": 3,
  "name": "__MSG_name__",
  "description": "__MSG_description__",
  "version": "1.0.9",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "16.png",
      "48": "48.png",
      "128": "128.png"
    }
  },
  "permissions": [
    "idle",
    "alarms",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "default_locale": "en",
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0db8e580-a314-4fcc-a77e-1769330f4911}",
      "strict_min_version": "109.0"
    }
  }
}