Tried it a few weeks. I only saw it working on a very few popular sites, and I had to click away around 90% of popups in my daily surfing. Maybe the problem is non-english (in my case manly German) pop-ups or some browser config (tough I even did a short trial in private window with only this extension explicitly activated) impairing it. Anyway "super agent" worked a lot better, tough I'd love to see this extension here succeed.