Use {Ctrl + F5} to reload that page from the server and by-pass the cache.

@the-edmeister Thanks so much for the proposal.

I tried pressing Ctrl+F5 while on the page but unfortunatley this did not solve my problem.

I saw another intersting thing: when I pin my site to a Tile on the new tab button - the banner is displayed on the tile. But when I click on the tile and the site opens the banner is gone again.

Golly this is a strange one. Kind regards

Found it. I open the web page, but only saw text. I did some testing. And I found AdBlock was blocking the image.

Open your Firefox to that page. Click the arrow next to the AdBlock icon. Select Disable on . . . .

@FredMcD - thanks very much - this put me on the track.

I could not find the AdBlock Icon on my browser - but I did find an "Ads Removal" extention in my Add-ons manager.

I removed the "Ads Removal" extention and that sloved my problem.

Thanks so very much.

This now leaves me with a question: should I use these types of ads on my websites if users are able to simply remove it and then nothing displays?

Kind Regards.

You can't control what a user does as far as how the web page is displayed when filters or other such things are used.