It does have the following:
* Security fixes
* Fixes for a number of non-security-relevant crashes, increasing the stability of the whole platform and the Mail & Newsgroups part of SeaMonkey
As for Security fixes, I see only:
Deal with bogus certs issued by Comodo partner (Bug 642395)
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.18) Gecko/20110320 SeaMonkey/2.0.13

