I had the same problem. It was Google Gears that did it to me. I deleted the Google Gears folder under the current profile in the .mozilla folder. The folder was ~300 MB in size and it slowed down FF on close even though Google Gears was disabled. You might have another problem, but it's a good thing to try out. Try in general to see if there is anything in the profile that is consuming a lot of disk space. Other people have reported elsewhere that deleting other large files in the profile has helped.
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