This new release can download it and read more on the official webpage.
I tested today and as you can see this is working well:

Tutorials and tips on Fedora Linux, Python programming, and software development. Clear guides, source code, and practical examples by Catalin George Festila.

Firefox is one of the latest versions of the Mozilla .
It is currently available in two repositories - Remi and Spot.
See the next steps if you want install Firefox 4.
First , go on super user shell.
# wget http://repos.fedorapeople.org/repos/spot/firefox4/fedora-firefox4.repo -O /etc/yum.repos.d/fedora-firefox4.repoNow, you can install Firefox 4
# yum --enablerepo fedora-firefox4 install firefox4That is all.