SeaMonkey is an all-in-one internet suite which uses the same engine as Firefox and Thunderbird, and also includes a newsgroup client, an internet relay chat (or IRC) client, and a flexible HTML editor.

Like Firefox, the best reason to start using SeaMonkey is its enhanced security. Built with your security in mind from the start, SeaMonkey keeps your computer safe from malicious spyware by not loading harmful ActiveX controls, and a comprehensive set of privacy tools to keep your online activity private and your computer safe.