Where is the option to close browsers before cleaning? I can't find it. It doesn't seem to exist.
It pops up when you analyze or clean while having a browser still open.
Nope, nothing pops up at all with either Chrome or IE9 open.
I take that back. It does pop up for Chrome but not for IE9 which is my preferred and default browser.
I believe IE9 can be cleaned while still running, I analyzed with IE9 open and closed and had the same files detected for deletion. But same no "Close Browser" Popup
edit:
http://forum.piriform.com/index.php?showtopic=35243&view=findpost&p=210910
Currently, it will try to close all running instances of Thunderbird, Mozilla and Chromium based browsers.