From an article @ informationweek.com:
http://www.informationweek.com/story/showArticle.jhtml?articleID=160401643
For the entire article, as well as a link to the patch/extension, use the link above.
Firefox Tests Beefed-Up Popup Blocker
The Mozilla Foundation is testing a patch to its Firefox browser that puts the kibosh on popup ads which have been slipping through the open-source browser's blocker.
http://www.informationweek.com/story/showArticle.jhtml?articleID=160401643
For the entire article, as well as a link to the patch/extension, use the link above.