Every time I try to add it, or Facebook blocker, it invites me to download Firefox for the 43rd time

Doesn't work on many pages.

Sounds like a good idea, but in practical use, it's not. For casual browsing, I guess it is probably useful, but for everything else, it just messes up. At work, I access documents on-line, which are opened as pop-ups (yes, it's stupid, but that's how it was designed and there is absolutely nothing I can do to change that and, because it's work, I have to deal with it, and for a good part of my day). White-listing my work's site didn't work, neither did the forceful open option (the pop-ups opened blank, because they were, actually, redirects from the add-on, so the site didn't trust them and, therefore, the access was denied). In the end, it caused more troubles than occasional pop-ups would.

doesn't work on youtube

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.

Installed to block one nasty site. It failed. Otherwise was working as expected until I found that it blocked my banking website. Despite whitelisting the domain (citi.com) and everything else I could try, the only recourse was to disable the add-on.

Funktioniert leider überhaupt nicht.

MAL VA

after last update, doesn't work correctly
used to be the the best, now worthless on most sites. please correct!
had to re-install version 0.4.2

after the update works incorrectly
shows an incomprehensible page on the livejourmal.com

livejourmal.com/talkpost_do.bml

impossible to show this page.

Poorly documented. Loaded with techy jargon. Few to no examples given of what is considered a "popup" - no graphic representations. I am still bombarded with pop up boxes and dialog windows and request to spam with notifications despite "strict" labeling.

HORRIBLE HORRIBLE HORRIBLE. I installed this to block pop-ups and instead "MY quick converter" has taken over my computer! Now I have to figure out how to uninstall all this crap. I thought this would be a trustworthy Firefox add-on. It is NOT!

One star for version 0.4.2 that started to report all popups and new tabs to Web of Trust (WOT) by default, a company that sells user identifiable data to third parties. The usefulness of this feature is dubious, the countdown is poor usability, WOT is not a good measure of a popup being wanted and the privacy leakage is too great.

Version 47 ????

Doesn't seem to be blocking anything even after tinkering with the options. Well done Mozilla for forcing an update on us that doesn't appear to let any popup blockers work... I'll have fun avoiding all the malware these things are trying to force on me.