What does clicking the icon do? Either it's grayed out or it's blue, but it still blocks popups? I don't get it.

Works perfectly and exactly as I hoped! The numbered explanations are very, very helpful! Now it's just a matter of time to add all of the pop-up sites in the lists. :D

muy bueno

Yes it's strict - enough to break most web pages. If that doesn't bother you perhaps getting a prompt on every single web site you visit might. It bothered me. I found it far too invasive to be practical.

It's very good

Whitelisting doesn't seem to work for onedrive and office online