Sorry this was not malware or a popup it was an eBay adChoice ( it had the AdChoice logo under it)  It was one of the ads directly under the seller information not a pop up.  Thats why I was annoyed.  There are all sort of ads in that position even ones for the rival auction site, which is fair enough, but there shouldn't be ones with false advertising.

I understand I can block it if I wish, that not the point.  eBay should be controlling what ads are on its site.