Performance / CPU hogging bug in Firefox 1.0.4

Hi,

I encountered a performance problem with Firefox 1.0.4 on Win2k (Pentium IV 1,6 Ghz), 
and there are already so many bugs filed for Firefox with the word "performance" in 
it, that I thought maybe you guys here know better whether this is a known problem.

If you try http://www.eclipse.org/proposals/eclipse-jsf/index.html and scroll the 
page, the CPU goes way up and scrolling is really slow. There is no Flash or anything 
 unusal on the page, as far as I can tell.

IE doesn't have any problem with that page and happily scrolls it snappily.

Thanks to anyone better in the know who is looking into this,
Jörg.