Why is Firefox 3.6.6 so slow?

== Issue
==
I have another kind of problem with Firefox
== Description
==
Firefox 3.6.6 is running REALLY slow.
Firefox just updated (automatically - I seemed to have no choice) to 3.6.6 on my Mac (OS 10.5.4) and is now running unbearably slow. Every website I try to load shows, at the bottom left "waiting for" (then website name) and loads very slowly, compared to Safari 3.1.2. I tried clearing the cache but that didn't help.
Even when on Firefox's own Mozilla support pages, it loads really slow.
What gives? Why did Firefox automatically update to something worse? Can I go backwards and reload the previous, faster version?
== Firefox version
==
3.6.6
== Operating system
==
Mac OS 10.5.4
== Plugins installed
==
lots

Well, this may not help anyone else, but I figured out my issue.
After reinstalling 3.6.4, it too was doing the same thing, using 25% CPU consistently, unable to move the window around, etc.
As bizarre as it sounds, this seems to have been an issue with having a tab open playing flash video during an update/install.
After 3.6.4 was doing it as well, I closed the justin.tv tab and restarted 3.6.4, opened justin.tv back up and it was fine using 2-4% CPU or so instead of 25%. Window can be moved around again too.
Downloaded the full 3.6.6 installer, closed the jtv tab, reinstalled 3.6.6, launched, and reopened a tab for jtv... fine still using 2-4% CPU tops.
Very bizarre. Nothing else changed during any of this other than whether I had JTV open and playing video during the update/install and subsequently if it would be loading as soon as it restarted after the update/install.
After the initial startup, I can close and reopen Firefox as much as I want with the JTV tab open and playing and it has no further issues.
Weird.

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