Install Mozilla Firefox 20/10 on Fedora 18/17/16/15/14, CentOS 6.4/6.3/6.2/6.1/6/5.9 and Red Hat (RHEL) 6.4/6.3/6.2/6.1/6/5.9
1. Backup your current Firefox 3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19 profiles (just in case)
tar -cvzf $HOME/mozilla-firefox-profiles-backup.tar.gz $HOME/.mozilla/firefox/
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2. Change root user
3. Install Remi repository
Note: Currently not needed on Fedora 18/17, CentOS 5.9 and Red Hat (RHEL) 5.9.
Fedora 15/14
## Remi Dependency on Fedora 16/15 ##
rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm
rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm
## Fedora 16 ##
rpm -Uvh http://rpms.famillecollet.com/remi-release-16.rpm
## Fedora 15 ##
rpm -Uvh http://rpms.famillecollet.com/remi-release-15.rpm
## Fedora 14 ##
rpm -Uvh http://rpms.famillecollet.com/remi-release-14.rpm
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CentOS 6 / Red Hat (RHEL) 6
## Remi Dependency on CentOS 6 and Red Hat (RHEL) 6 ##
rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
## CentOS 6 and Red Hat (RHEL) 6 ##
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
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4. Check Available Firefox versions
Fedora 18/17
Fedora 16/15/14, CentOS 6.4 and Red Hat (RHEL) 6.4
yum --enablerepo=remi list firefox
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CentOS 5.9 and Red Hat (RHEL) 5.9
Note: Firefox 10 available.
5. Update or Install Mozilla Firefox 20/10
Fedora 18/17
yum update firefox
## OR ##
yum install firefox
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Fedora 16/15/14, CentOS 6.4 and Red Hat (RHEL) 6.4
yum --enablerepo=remi update firefox
## OR ##
yum --enablerepo=remi install firefox
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CentOS 5.9 and Red Hat (RHEL) 5.9
yum update firefox
## OR ##
yum install firefox
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Note: Firefox 10 available.
6. Start Firefox 20/10
Then start Firefox with using command:
Or use Firefox (20/10) launcher.
Firefox 20/17/16/10 Screenshots
Firefox 20 running on Fedora 18

Firefox 17 running on CentOS 6.3

Firefox 16 running on CentOS 6.3

Firefox 10 running on CentOS 6.2

Firefox 10 on Fedora 16 Acid 3 test 100/100 :)

Reference: http://www.if-not-true-then-false.com/2011/install-firefox-on-fedora-centos-red-hat-rhel/
Always go with the choice that scares you the most, because that's the one that is going to require the most from you!