Mozilla features fully compliant standards support, including HTML 4.0, XML, CSS, and DOM, and is small, fast, and modular. Since its inception, Mozilla has been built as an open-source product, meaning the source code is publicly available. Mozilla's interface employs the standard browsing paradigm with Back, Forward, and Refresh buttons. It is skinnable, meaning you can download new looks for it. It features the ability to disable unrequested pop-up windows on Web sites. It also lets you open multiple browser windows and display multiple Web pages in a single tabbed window at the same time.

Version 1.7.1 was released to fix a security hole.