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fix for safari 5.1.5 crazy memory?

Not really expecting an answer here - though that would be great. Seems pretty obviously a severe Safari 5.1.5 issue that I'm hoping to make higher priority for Apple by posting here.

--> so if this is happening to you please join in

Start Mac (mine:PB17, 10.7.3, 8GB ram, no FlashBack trojan), nothing running but activity monitor. Start Safari (no java, no flash, no extensions). CPU jumps into the 90+% and active memory starts ticking upward at 20MB per second until all ram is used and the system starts swapping and everything slows to a crawl. Also, Safari un-quitable. Only force-quit works, at which point all memory & cpu use goes back to normal.