LinuxNOV.com posted a quick guide about installing Mozilla Firefox 4 on Fedora RHEL CentOS using Remi Repository
Here's the installation instructions using remi repository for Mozilla firefox 4 final release on Fedora 14 Laughlin. Also check Mozilla Firefox 4 quick look at new features and installations instructions for different distributions Here.Install Mozilla Firefox 4 On Fedora RHEL CentOS Using Remi Repository