Firefox 8 is using massive amounts of memory, currently 2 G with only a few tabs open.

I just upgraded to Firefox 8, but it is using such enormous amounts of memory that my computer has slowed to a crawl. According to Task Manager, memory usage is now down to 1.3G but still that's so much that it's hard to see what I'm typing. The previous versions of Firefox didn't use nearly so much. If this can't be fixed, I will have to use Google Chrome or IE even though I much prefer Firefox. Closing tabs in Firefox maxes out CPU usage, and this is a new computer with lots of memory. I think this is a bug. I don't want to have to go in and disable features that I have been using. Can you tell me when there will be a fix for this?

I'm running Firefox 8.0.1, no add-ons, no themes, no bells or whistles. Firefox takes up large amounts of my memory and brings my computer to a crawl. I'm well educated in A+ Network+ and Cisco CNA I am by far a very educated user and can not solve this problem myself.
I hate to say it, but Firefox is slipping in quality and I may have to switch to Opera if this problem can not be resolved. It's been an issue since v.5 and continues to be a pain.

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