Hi there,

Thanks for your message! "Run in private windows" in enabled in v.8.12.11. In case it has been deactivated by mistake in your case, you can read more on how to set it up here: https://support.mozilla.org/en-US/kb/extensions-private-browsing

For any further issues, please send us a message at support@ghostery.com.
We're always happy to help!

Best,
Ghostery Team