Firefox now offers the upgrade via the Help menu.
Before it did not, it would only upgrade version 2.
Now it will take it to version 3.1.
Did my PC at work first, then I did my PVR PC in the spare room.
Just did my gaming rig that is my main PC.
Will do the laptop later when I fire itup.
Here is a speed test after upgrading Firefox.
Pretty good since my service is 8 megabit down, and 3 megabit up.
24 megabit is the norm most of the time.
If I take the router out of the equation, I can get close to 30 megabit sometimes.
All of my plugins for Firefox are compatible too with the upgrade to version 3.