Why does firefox 3.6.15 close so slowly and erratically?

'''bold text'''When I close down the web browser after viewing any web site, the window closes very slowly and erratically.

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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Why does firefox 3.6.15 close so slowly and erratically?

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