Summary
The remote host is missing an update to the system as announced in the referenced advisory.
Solution
Update your system with the appropriate patches or software upgrades.
http://www.mozilla.org/security/announce/2011/mfsa2011-11.html http://www.vuxml.org/freebsd/b2f09169-55af-11e0-9d6f-000f20797ede.html
Insight
The following packages are affected:
firefox
libxul
linux-firefox
linux-firefox-devel
linux-seamonkey
seamonkey
