Twice this morning I've gotten a pop-up on HTF with the title Authentication Required.
The body says:
A username and password are being requested by http://ushepublicity.com. The site says: "ushepublicity.com"
followed by two fields, Username and Password. There's no other text or identification.
I'm able to "X" out of it, but this is totally new. I have no idea whether it's being generated just on this site, or if it's coincidence that this is where I've been reading and posting this morning, and it might happen elsewhere, too.