Having dug a little deeper, I found a post which stated that Selenium 
Webdriver does not support opening links in a new tab:
http://code.google.com/p/selenium/issues/detail?id=3380

This make sense, as it doesn't support navigating between tabs, only 
between windows. Otherwise you wouldn't be able to get back to the 
previous tab, rendering the purpose of using tabs somewhat moot.

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