Firefox 15.0.1 Fixes Bug That Exposes Visited Websites
 

We told you last week of Mozilla's release of Firefox 15 and this week, we introduce you to version 15.0.1 to correct a 'Private Browsing Mode' flaw that was saving visited websites in the private mode. Because temporary files are saved inside the cache together with their original URLs, they can expose what websites users visited while the browser was running in Private Browsing mode.

http://www.hardocp.com/news/2012/09/...ed_websit es/