SeaMonkey 2.21 发布， 互联网应用套件

它是一个互联网应用套件，包括：一个网页浏览器、一个高级邮件程序、一个IRC聊天客户端和一个HTML编辑器。

SeaMonkey曾经是Mozilla基金会内部一个负责管理工作的小组的名称。SeaMonkey致力于在从过去的“Mozilla浏览器套件”中分离出来的代码的基础上，开发可供使用的浏览器套件。它成功的继承了Netscape Communicator的衣钵。

该版本基于Firefox4，应用了最新网络技术如HTML5，硬件加速技术并改善了JavaScript的速度。

发布说明: Implements an option to thread messages received by date. Allows deletion of news posts by default. Implements optional taskbar preview-per-tab. Adds support (permission prompt) for desktop notifications. Adds an Isn't operator for searching by priority. Support for a new scrollbar style on Mac OS X 10.7 and newer. Accessibility-related improvements on using pinned tabs. Major SVG rendering improvements around Image tiling and scaling. Removes support for sherlock files that are loaded from application or profile directory. Support for W3C touch events is disabled