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@performance_parts_clearance_centre wrote:

Far more likely to be related to the actual browser than the specific web-page, I'd think. Possibly a rogue extension or script of some sort.

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Adware,(possibly when the browser updated).

Check here for explanation of what may be occurring.

They're not actually pop-ups.  They take you to a completely different webpage.  I just got another one, different to before.  No black filter on this one, different web address, no windows logo - this one is addressed to google users.  Nope, not going to fall for this one either!

I can imagine a lot of people will be put off using ebay by this sort of thing.  I was using another tab and when I went back to my All Selling page I got the other page instead.

Looks like malware to me.

If it was an eBay thing, I would expect everybody to get it. I certainly haven't been hit, but I have reasonable security, no malware and POPUPS BLOCKED.

Yes, I agree. Using Malwarebytes could help.