The remote host is missing an update to xulrunner-1.9.1 announced via advisory USN-853-1. A number of security issues affecting xulrunner and Firefox have been corrected. For details, please visit the referenced security advisories.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 8.04 LTS: firefox-3.0 3.0.15+nobinonly-0ubuntu0.8.04.1 xulrunner-1.9 1.9.0.15+nobinonly-0ubuntu0.8.04.1 Ubuntu 8.10: abrowser 3.0.15+nobinonly-0ubuntu0.8.10.1 firefox-3.0 3.0.15+nobinonly-0ubuntu0.8.10.1 xulrunner-1.9 1.9.0.15+nobinonly-0ubuntu0.8.10.1 Ubuntu 9.04: abrowser 3.0.15+nobinonly-0ubuntu0.9.04.1 firefox-3.0 3.0.15+nobinonly-0ubuntu0.9.04.1 xulrunner-1.9 1.9.0.15+nobinonly-0ubuntu0.9.04.1 Ubuntu 9.10: firefox-3.5 3.5.4+nobinonly-0ubuntu0.9.10.1 xulrunner-1.9.1 1.9.1.4+nobinonly-0ubuntu0.9.10.1 After a standard system upgrade you need to restart Firefox and any applications that use xulrunner, such as Epiphany, to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-853-1