The remote host is missing an update as announced via advisory SSA:2009-209-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2009-209-01

A new mozilla-firefox package is available for Slackware 12.2 to fix security issues. The updated packages may also be used with Slackware 11.0 or newer. More details about the issues may be found on the Mozilla website: http://www.mozilla.org/security/known-vulnerabilities/firefox30.html