Good thought, but no, actually running very few extensions.
(has a look)
Actually, I think none, since I had to do a Windows reinstall. There only seems to be a couple of skin files in there, and I'm still using default. It says down the bottom of the About window:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:184.108.40.206) Gecko/2009011913 Firefox/3.0.6