I would try to find the newly opened window, either through $mech->application->openTabs() or by finding the opened Window from within the opening window, depending on whether Javascript is used to open that window or not.

Then, closing that window is a simple matter of calling the ->close method on it:

$window->close(); # this is window.close() from Javascript

[download]

In reply to Re: WWW::Mechanize::Firefox -- how to close firefox browser window by Corion
in thread WWW::Mechanize::Firefox -- how to close firefox browser window by jbernest

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