[CentOS] Repository for last packages (firefox, etc.)

Hello,

I read an article on the site lwn.net (http://lwn.net/Articles/397034/). My
question (a newbie question !) is : where may I find these packages
xulrunner-1.9.2.7-2.el5.x86_64.rpm and firefox-3.6.7-2.el5.centos.x86_64.rpm
?

Regards,

Yann
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