Thanks Ravyns, I had managed to block it by using Ad Blocker but I was uneasy as this did not remove the files in question.  As it is a browser extension it is not seen as a virus by an number of anti-virus programs, I found out the hard way.  The link you provided has a much more complete list of the names this particular extension goes under and it is a long list.  From this I have now been able to identify and un-installed the extension and taken a number of the precautions suggested.

 

Thanks again.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.