I have seen the same behavior (I haven't checked CPU usage).  About Firefox 
shows:
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.10) Gecko/2009042523 
Ubuntu/9.04 (jaunty) Firefox/3.0.10
My computer specs are:
Grafik: NVIDIA® GeForce® 8100, max. 512 MB shared Memory, VGA, DVI, DirectX® 10
Mainboard: Biostar GF8100 M2+ TE, Sockel AM2+, GeForce 8100 Chipset, 1× ATA - 
UDMA 133, 4× SATA II, 4× USB 2.0 + 2× Front-USB, 1× PCIe X16 (v2.0), 2× PCI, 2× 
PS/2, 6-Kanal HD Audio

After a freeze I found the following at the end of the /var/log/Xorg.0.log.old
(II) NVIDIA(0): Initialized GPU GART.
(this repeated 15 times in total)
(II) NVIDIA(0): Initialized GPU GART.
(EE) NVIDIA(0): Error recovery failed.
(EE) NVIDIA(0): *** Aborting ***

After a normal shutdown of Firefox with a single tab open there are no
messages  "Initialized GPU GART."

The behavior is quite repeatable, and it freezes every time I shut down
multiple tabs.  The number of " Initialized GPU GART." messages seems to
vary.  I can not use ctrl-alt-del to reboot, but the past 3 or 4 times I
used ctrl-alt +R,E,I,S,U,B and had a successful restart without powering
off.

-- 
Jaunty beta freezes when we try to close firefox browser that has more than one 
tab open.
https://bugs.launchpad.net/bugs/357718
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