i-sako.com

Over the past several weeks, I have encountered a strange pop-up ad that hijacks Firefox and will not relinquish control unless Firefox is forcibly shut down. Has anyone seen this before? (Click on the image to see a larger version.)

It’s the same ad every time. I’m wondering if this represents a Firefox vulnerability or something more sinister, like malware on my PC.

Update:
Well, it turns out to be malware after all. It seems that ErrorSafe is a reasonably well known piece of scareware. Symantec has generously published instructions on how to remove it. Seems like a pretty tedious process, though. I’m now wondering if it wouldn’t be a better idea to simply back up all of the data my wife and I need and then completely reinstall Windows—or better yet, go back to being a no-Windows household again.