Mozilla's new security chief won't say outright whether Firefox is more secure than Internet Explorer. <A HREF="http://news.zdnet.com/2100-9588_22-6118060.html?tag=nl.r23660">Window Snyder, formerly of Microsoft,</A> now heads up security at Mozilla, the company best known for its open-source Firefox Web browser. While Microsoft is often criticized over the security of its products, Mozilla is seen in a more favorable light. Yet Firefox and other Mozilla products have their share of security problems.