I just did a little testing with the firefix-10 from the sl 5.8 alpha 
(loaded on an sl5.7 machine).

Pretty much everything works as expected - except that the bookmarks 
toolbar (for a new profile) contain 4 links to redhat.com which you may 
want to replace at some point.

This isn't the case for the firefox-10 in sl6 so I assume that srpm 
contains a patch which may be relevant...

  -- Jon