From: Joel Pearson <lists@...>
Date: 2012-11-08T18:48:20+09:00
Subject: Re: Closing popups watir-webdriver

I think your best bet is probably to loop through the active windows and 
close each, something like this:

browser.windows.each {|w| w.close rescue nil}
browser.close rescue nil #The previous line should do this, but it's 
best to be sure

If you run that at the end it should close all webdriver windows.

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