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cpu hogging on upgrade to firefox 4, 64 bit, MBP 17" 2010 core i7

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activity monitor shows cpu 100 and more, firefox hungs, worse then before the upgrade to version 4. I have many tabs open, but previous version of ff was able to handle it.

my machine has 8gb ram

activity monitor shows cpu 100 and more, firefox hungs, worse then before the upgrade to version 4. I have many tabs open, but previous version of ff was able to handle it. my machine has 8gb ram

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no fix yet ??????