A must have along with uBlock Origin, a lot of popups still slip through Firefox's popup blocker, with this extension you won't have to worry about any popups.

AWESOME SET AND FORGET
SET AUTO ANSWER TO NO NEVER NEED TO WORRY
BLOCK JAVASCRIPT POPUP AS WELL

Stop to work... after last firefox update i have popups all time.

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.