The remote host is missing an update as announced via advisory SSA:2009-306-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2009-306-01

New mozilla-firefox packages are available for Slackware 12.2, 13.0, and -current to fix security issues. The Firefox 3.0.15 package 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 http://www.mozilla.org/security/known-vulnerabilities/firefox35.html