Firefox sometimes grabs 50% of my CPU, which slows my computer. Any suggestions for fixing this?

It usually seems to occur when I'm trying to get into a secure account (my 401k) or download something, but not always. Sometimes it just seems to occur when I've been on-line for awhile. I just downloaded Firefox v3.6.

That is exactly what I just experienced. Firefox is open on one tab, google search has just been run so nothing should be going on but 50% of CPU is sucked up doing who knows what.
Occasionally when I'm typing in, there is not echo back for several seconds. This sucking up 50% of the CPU goes on over and over again. 50% is the tops but you can't do anything at that point.

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Firefox sometimes grabs 50% of my CPU, which slows my computer. Any suggestions for fixing this?

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