The problem is Google Tool Bar, disable it and you will be able to open more 
than three windows without FF locking up at 100% CPU usage.
It worked fine before the Gutsy update.

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Firefox uses high CPU for extended periods of time when spawning a new window 
with many tabs already open
https://bugs.launchpad.net/bugs/66350
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Bugs, which is the bug contact for Ubuntu.

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