Escappely the interfase in the Windows version.
Sadly, the Linux version isn't. :(
Before: The interfase is like Internet Explorer 6.
After: That's a lot better! :D
No, this is for Windows only.
So XP has a green Orb for Back and Forward, while Vista has blue.
This is Firefox 3, as seen in Ubuntu 8.04.1 LTS.
But, Linux users can also enjoy the new interfase.
How?
Open the Terminal (or Konsole in KDE), and typ this in:
sudo apt-get install wine
Note: This is for Debian/Ubuntu users only.
For other distributions, download their package from Wine HQ.
Ones installed, open a webbrowser and search for Firefox for Windows.
For the lazy people, Click here.
And run the setup, like you do in Windows.
Now you can eventually install some Windows only plug-ins, like Shockwave.
After the setup, go to your C map (/home/NAME/.wine/drive_c) and go to the directory where you've installed your Firefox in.
You'll see something like "firefox.exe", run it!
Well, enjoy it, my son.
If you don't believe me:
Read both of them.