I just discovered the new version of Firefox allows you to install themes (similar to Windows Media Player). You can find a sampling of themes here. In evaluating the different web browsers, it appears to me that Firefox has gotten way ahead of the competition.
Also, what's up with people not criticizing Apple's policies with respect to their browser? Apple's new Safari RSS handles RSS feeds and tabbed browsing, but is available only if you switch to their latest operating system. Hah, and all those people who embraced Apple as the anti-Microsoft should be feeling very good with the Mac's embrace of Microsoft-style coercion!