The remote host is missing an update as announced via advisory SSA:2009-069-02.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2009-069-02

New mozilla-firefox packages are available for Slackware 12.2, and -current to fix security issues. The new packages may also be used with earlier versions of Slackware. More details about the issues may be found on the Mozilla website: http://www.mozilla.org/security/known-vulnerabilities/firefox30.html