Rated 5 out of 5 stars

Superb! It blocks one of the most difficult and intrusive popunders I have found on the web, namely creatives.livejasmin.com
AdBlock Plus, AdMuncher, RequestPolicy & Close Popup Advertising were all unable to block this 'nasty'. Adding the link to Hosts was able to block it but was still unable to stop the popunder window from opening. Simply adding the link to BlockSite blocked this popup / popunder completely. I rest my case.

This review is for a previous version of the add-on (0.7.1.1).