qt5-qtwebkit before 5.4 records private browsing URLs to its favicon database, WebpageIcons.db.Referenceshttps://bugzilla.redhat.com/show_bug.cgi?id=1204795http://www.openwall.com/lists/oss-security/2015/11/05/4https://codereview.qt-project.org/#/c/108936/
