It isn't. It's an entirely different program. Firefox diverged from Mozilla years ago, and SeaMonkey is just the modern version of Mozilla, which itself was derived from Netscape. Very little is similar between Firefox and SeaMonkey at this point.

If anything, Firefox from its inception has always been less bloated than Mozilla/SeaMonkey, because the latter is designed as a full-featured "Internet suite" including an email client, a newsreader (for Usenet), an HTML editor, and an IRC client. Firefox, on the other hand, is just a Web browser.

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