Broken with Firefox? XML Parsing error: not well-formed?

The http://www.w3.org home page is currently not viewable in Firefox 
1.06.  This would seem to be bad form.

Is this a bug in Firefox or is the page currently broken XML?

In the past, some problems with W3.org directories has been that both 
the .xml and .html versions of pages were present.  Firefox advertises 
that it can handle both and if you don't specify the default for the web 
server to be .html, it returns .xml in a way that is normally not 
intended for W3C publishing style.  You might want to fix this for at 
least the home page.

Note that both http://www.w3.org/index.html and index.htm are not found.

Thanks
sdw