Firefox using massive CPU resources, even with no addons?

I've been trying to figure out why Firefox is using ridiculously large amounts of CPU resources, but can't seem to find anything. At the time of writing this, I have 5 tabs open, none of which are highly graphic- or sound-intensive (facebook, 3 articles and this) and no add-on toolbars running. I updated to FF7 the other day, primarily because FF wouldn't open without doing so, and it's currently using a little over 625K in CPU.
I've tried restarting, but it starts at around 105K and skyrockets to around 300K within 5 minutes and I can't think what to do to sort it out. I've tried running it in safe mode, but there's no difference to the CPU usage. Add to that the fact that I can't even run another program at the same time (making me choose between music or internet), and frankly, it's driving me up the wall.
I don't want to change browsers, for the simple reason that I prefer FF in terms of usability and appearance, so I'd prefer a fix if possible. The troubleshooting information included is from my current session, which does have some addons re-enabled, since disabling them did no good whatsoever.

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Firefox using massive CPU resources, even with no addons?

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