Mozilla has released SeaMonkey 2.0.6 (http://www.seamonkey-project.org/), an update of the app thta combines Firefox and Thunderbird. The new version offers security fixes.
SeaMonkey runs on Mac OS X, Windows and Linux systems. It uses the same internal platform as Firefox 3.5.4 now. Due to this change SeaMonkey is now much closer to Firefox as far as user profiles, add-ons and functionality of user interface elements are concerned.