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The trick i use is left click on the tabs on the bottom of the screen, that stops it from multiplying, then click the x on the IE tab. You'll get the little pop-up, click the x in the corner....you'll have to do it like 50 times.. but at least you won't have multiple tabs.
I forced my browser to quit, turned off my wireless networking, re-opened my browser (choosing 'restore session'), found the tab, killed it, then turned wireless networking back on.