Bypassing page that automatically opens

So I was in Facebook in Safari and accidentally clicked a link that went do pcsupportmessage dot com. (I really hate Facebook more and more every day.)

DO NOT GO THERE.

It's now in a loop that loads spam alerts like this continuously

I can't see any way to get past them.I can't do anything at all in the application. I can't close the page. I can force quit the application, but when it relaunches it reopens the page.

Anyone have a way around this? Thanks very much.