The Firefox 3.0 RC2 don't install the adobe flash player plugin

Name:    Jose Henrique
Product: Firefox Release Candidate
Summary: The Firefox 3.0 RC2 don't install the adobe flash player plugin

Comments: 
When I access the web site http://g1.globo.com/, the firefox ask for the
flash player. I install but it don't install.

Browser Details: Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-BR; rv:1.9) Gecko/2008052906 Firefox/3.0
From URL: http://hendrix.mozilla.org/