Netcraft has a article about some of the security issues that are showing up in non-IE browsers.
Internet Explorer isn’t the only browser vulnerable to spoofing, as evidenced by the discovery of security holes in Firefox, Mozilla and Opera.
They also talk about the dangerous trend for IE.
Thus far, services tracking browser usage report only incremental gains for Firefox, Mozilla and Opera, with some suggesting IE has lost about 1 percent of its 90 percent-plus market share. But Firefox in particular seems to be catching on in some quarters, as was evidenced at the recent BlogOn2004 conference for weblog aficionados. During a Microsoft presentation about its Channel 9 blog outreach, a presenter asked “Show of hands…How many of you use Internet Explorer?” Not a single hand went up.