Humming while running firefox

Whenever I browse the internet for more than a minute or two, my powerbook starts to hum.
Its not a spinning up sound, like the hard drive has started working. It is much louder, and sounds like something is working TOO hard. the humming comes from under the keyboard, more to the left than right, but not significantly more.
Sometimes after it has been humming for a couple of minutes, firefox starts to lag and occasionally crashes.
I had a similar problem to this last year, and it ended up being the hard drive, but I replaced it and since then it has been fine. Also, when it was the hard drive, there was nothing regular about when the humming started. It would just start anytime, no specific trigger.
I ran a hardware test and everything checked out ok. I also check my RAM, and both cards are recognized.
Could this just be my computers sick way of telling me I spend too much time on the internet???
Any advice greatly appreciated.
Thanks in advance.
Caity

My PowerBook and iMac both will rev up just sitting at NBA.com for example, a graphics intensive site at times.
Run Activity Monitor from the Utilities folder and watch what is going on.
Joe

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