Opera confirmed Wednesday that its latest browser, 8.01, would display the pop-up's origin, letting a user inspect its URL to see if it came from a trusted site.

A scam is directing Google Chrome users to copy and paste malicious malware onto their computers.

In an alert published on Tuesday, Secunia said that the flaw would allow a phishing attack where a malicious JavaScript pop-up window appeared in front of a trusted Web site.