Firefox issue

For those of you using Firefox on an XP computer, have you noticed it slowing down? Over the weekend, I checked and the amount of CPU it is taking up was just continually fluctuating, often up to the 90% range.

It appears to be a problem with the latest version (3.6.2), although I also had the same problem in the 3.6 version before I updated it. I see that people have been complaining about it since 3.5 too.

The specific thread on Mozilla on the problem with 3.6.2 has been marked as "solved", but the answer it refers to is no such thing.

This page talks about the problem generally, but I am bit puzzled why it has only come to light on my computer now.

UPDATE: I seem to have solved the problem by updating both Flash and Java, as some website suggested.

I am tempted to try Chrome now though, as I understand it is starting to provide extensions.