If you’re a Fedora fan, and curse its downside as opposed to Ubuntu where you can add Official PPAs. Here is what I’ve found.
Remi an official Fedora projects contributor does help older distros to work with latest packages by publishing the new ones. The site supports last 2 EOL Fedora releases.
Install the correct release, as for my Fedora-14, I installed remi-release-14.rpm
$ sudo rpm -ivh http://rpms.famillecollet.com/remi-release-14.rpm
For some reason, the repository is disabled, Enable it by opening the file in VIM
[remi] name=Les RPM de remi pour Fedora $releasever - $basearch #baseurl=http://rpms.famillecollet.com/fedora/$releasever/remi/$basearch/ mirrorlist=http://rpms.famillecollet.com/fedora/$releasever/remi/mirror enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi failovermethod=priority
I got Firefox 10x , Thunderbird 10x installed on my Fedora 14 (Laughlin) !