Since updating to 3.6.17, Firefox has twice taken over 50-70% of CPU time. Why?

I accepted an update to Firefox 3.6.17 a few days ago. Yesterday, and again today, Norton has notified me that Firefox is using an abnormal amount of CPU time. In each case, I confirmed this with Windows Task Manager. For extended periods, the CPU usage was 70% or greater, and did not come down until I rebooted my computer.

I have similar problem only using XPPro/SP3. Once open even if just sitting unused it continues to gobble memory and crashes. It crashed a couple of times a day since the update, has locked the system up a couple of times and crashed a total of 14 times today, the last three while trying to send crash reports. All since the 3.6.17 update. From scanning the forum looks like Apple folks are having similar problems with the last update as well. Even with FF4
FF has become so unusable (The last time it crashed while sending the crash report from the previous crash) that I'm posting this using Opera 11.

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    ~~~~~~~~~~~~~~~
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