Here are a couple of ways to install/update your current version of Mozilla Firefox to the last stable release Firefox 7 on Fedora 15 Lovelock and Fedora 14 Laughlin.
To find out What’s New in Mozilla Firefox 7 and installation instructions for Mozilla Firefox 7 on Ubuntu 11.04 and Ubuntu 11.10 using PPA.
Install Mozilla Firefox 7 On Fedora 15 Lovelock
Mozilla Firefox 7 built successfully by xhorak.
To install it. Run terminal, then type.
su -c'yum install http://kojipkgs.fedoraproject.org/packages/\
xulrunner/7.0/1.fc15/i686/xulrunner-7.0-1.fc15.i686.rpm\
http://kojipkgs.fedoraproject.org/packages/firefox/7.0/1.fc15/\
i686/firefox-7.0-1.fc15.i686.rpm'
xulrunner/7.0/1.fc15/i686/xulrunner-7.0-1.fc15.i686.rpm\
http://kojipkgs.fedoraproject.org/packages/firefox/7.0/1.fc15/\
i686/firefox-7.0-1.fc15.i686.rpm'
Also you can install using Remi testing repository firefox-7.0-1.fc15.remi.x86_64.rpm.
Install Mozilla Firefox 7 On Fedora 14 Laughlin
Also Mozilla Firefox 7 available to install on Fedora 14 Laughlin using Remi repository.
You can apply Remi repository by installing Remi auto configration package for fedora 14.
Then run terminal, and type.
yum --enablerepo=remi update firefox
firefox-7.0-1.fc14.remi.x86_64.rpm package.
That’s it for now.

Or the package maintainers could actually do their jobs and update the repository? Why is Linux the only OS that this update isn’t automatic?
Because stupid operating systems don’t have installed software package management, Firefox can update automatically.
Decent operating systems have installed software package management, so it would be incompatible, by design, to allow applications to override it.
ooo,,
so yes the way, I just found out..
I will try immediately at home..