Pop-up window always comes up even though the pop-up blocker is enabled, and a couple times, it was a virus that locked up my computer and tried to infect me. I had to forcefully shut down Firefox. Now that they are INSISTING that we disable our ad-blocker, I am completely removing Youtube MP3 Downloader from my computer if they don't reply back saying that they will allow the ad blocker. It's one thing to try to infect me, but this new policy is a total deal breaker.