Heat and fan on new MacBook Pro:

I got a new MacBook Pro. This is my second. The first never had this problem.
The new one differs by having a larger hard-drive 750GB and 8GB of memory but
is otherwise very similar.
   But with the is new one, it get very hot on the bottom (below the keyboard) and the
fan keeps running, probably trying to cool it doen.
  Is there anything I can do to keep the machine cool (short of leaving it in the refridgerator
overnight)? and can I reduce the fan noise?
Thanks in advance

The only thing that takes up more than 10% is firefox, which has gone over 50% on occasion.
I like to keep many firefox windows open. But I guess I shouldn't do that.
What is interesting is that if put the computer into sleep mode and then wake it up, it turns off the
fan for a few minutes.
But something is different between my old 4GB Macbook Pro and this new 8GB one.
It is alot noisier and hotter.

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