[Bug 748087] [NEW] launchpad takes 100% CPU in Xorg during scroll

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I'm sure this must be a dup since I've seen this behavior for a couple years now, but searches aren't finding similar reports.
The problem is that when I visit Launchpad in Firefox on my MacBook 6,2 (4 CPUs @2.67GHz, 3.7 GB RAM, .07 typical load,) my CPU usage jumps to 100% when I try to scroll the pages. See attached screenshot. All the peaks in that image are me simply scrolling up and down on a not-so-big page. Here's a typical example of a page that causes 100% CPU utilization when I attempt to scroll up and down:
https://bugs.launchpad.net/midori/+bug/706908

It was the same in FF 3.x with Ubuntu 10.04, 10.10, and now with FF 4.0
on Natty 11.04 A3

** Affects: firefox
     Importance: Undecided
         Status: New

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launchpad takes 100% CPU in Xorg during scroll
https://bugs.launchpad.net/bugs/748087
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