seamonkey version 2.6 fixes several security issues:

* MFSA 2011-53/CVE-2011-3660: Miscellaneous memory safety
hazards
* MFSA 2011-54/CVE-2011-3661: Potentially exploitable crash
in the YARR regular expression library
* MFSA 2011-55/CVE-2011-3658: nsSVGValue out-of-bounds
access
* MFSA 2011-56/CVE-2011-3663: Key detection without
JavaScript via SVG animation
* MFSA 2011-58/CVE-2011-3665: Crash scaling to
extreme sizes