I have been looking for a way to install FireFox 4 in my unit i’m using Fedora 14 and luckily here it is
Open up terminal and place this code
su -c 'wget -P /etc/yum.repos.d/ http://repos.fedorapeople.org/repos/spot/firefox4/fedora-firefox4.repo'
After that do this
su -c 'yum install firefox4'
Then it will install FireFox 4 and after that your done. Simple right? Hope this post is useful to you guys.