Fire Fox is my favorite browser for developing and debugging web applications. It sounds as though Mozilla (the developers of Fire Fox) are making security a priority for 3.0 release.

"The SOAP implementation dropped from Firefox 3 was only available to extension authors, who have many other more modern implementations to choose from," Schroepfer explained. "We are, in general, removing as much old code from the core browser as possible to improve security, reduce download size, and allow Web and extension authors to choose the latest support libraries they need."

Mozilla Aims At Cross-Site Scripting With FF3

If the Fire Fox developers can increase speed & reliability along with security then Fire Fox stands a chance to continue to take market share from Internet Explorer.