I don't know how this works for normal pop-ups, because I already have a extension that blocks them. but I wanted one to block annoying ones that open a new tab every few times I click on a html5 player to choose a control. this add-on did not do anything more than my old one did from another author.

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.