Only it's not Windows 7, but Firefox 7.
I downloaded it as a .tar.bz2 file and used alien to convert it into an RPM. You do that by typing SU in Konsole, then your root password. You have to use this this command:
alien -r firefox-7.0.tar.bz2
(Obviously you need to have alien installed)
You wait a bit and then the terminal tells you that it's done. You find a firefox-7.0-2.noarch.rpm file and click on it to install it.
I noticed that this procedure substituted the Firefox 6 that I downloaded from the MIB repos.
Since I'm still using Mandriva 2010.2, I guess that's the best way to switch to Firefox 7 which, by the way, is performing great in my system. All my favorite add-ons work and it's fast. About the changes, well, to be honest, I see the same browser I was using... I guess they are only visible to technical users.