Trojan.U83

It's bogus. Force quit Safari and start a new session by holding shift before you click the Safari icon.

How to force a Mac app to quit

1. Choose Force Quit from the Apple () menu, or press Command-Option-Esc. This is similar to pressing Control-Alt-Delete on a PC.
2. Select the app in the Force Quit window, then click Force Quit.

zelmik wrote:

A “Message” tab appeared on Safari while I was browsing. It said the lady website had infected my machine with a Trojan.U83. Immediate repairs were required and if I closed the window, permenant damage would be caused.

Read: Phony "tech support" / "ransomware" popups and web pages by John Galt for an excellent User Tip.

Sounds like a pop up. You're safe to close the window. They just want you to install their software and then you'd actually be infected.

To be safe, I'd download Malwarebytes for Mac. It's free. Run a scan to see if there are any issues, but it sounds just like adware.

Cheers!

CrashBurner

Be sure to give John an appropriate rating on his User Tip. ➕

It's a scam. For money and stealing your information.

Some times they can really take over the browser, although not as much as in the past.

When I'm on some video sites, the popups do that a lot.