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.

"The problem is that JavaScript dialog boxes do not display or include their origin, which allows a new window to open — for example, a prompt dialog box — which appears to be from a trusted ...