A strange DIV appears all over the place

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There is this DIV that appears after I save any text, be it a product description, blog post, mega menu item, collection description, etc. this is it:

<div id="whitelisted" style="position: fixed; width: 100%; height: 100%; background-color: #00006c; z-index: 99999999999999999999; display: none; top: 0; left: 0; opacity: 0.99;"><iframe style="width: 0; height: 0; display: none;" src="//remove.video/pblock"></iframe></div>

It seems to have no function whatsoever and in some places it is repeated several times one after the other. When I delete it and save the page, it then appears again. I guess it might slow down the site.

Has anyone got any experience with something like this or any idea how I should get rid of it?

Thanks a lot in advance!