Facebook block or false positive?

[fonebone]

This site, 

https://www.maltasupermarket.com/

once logged in always pops up a Facebook chat icon and then when any interaction with the site is made it throws an Malwarebytes warning and tries to go to this page: extension://ihcjicgdanjaechkgeegckofjjedodee/app/eventpages/block.html?referrer=null&url=https%3A%2F%2Fworldcoolnewz.com%2F%3Fs%3D700426933732913439%26ssk%3D32de89226a76e5b331de213ca84e6b1b%26svar%3D1688558313%26z%3D4839563%26pz%3D4662709%26tb%3D4662728%26l%3DWGYVPKNMPvY53zb&host=worldcoolnewz.com&type=malware&subtype=riskware&tabId=954395166&filename=undefined&prevUrl=null or some other such site. Sometimes it will be www.facebook.com, but in this case it was "worldcoolnewz.com".

The owner of 

https://www.maltasupermarket.com/

 tells me it's malware on my PC (although we've tried on different devices in the house and they all have the same problem) and obviously we've scanned using Malwarebytes but found nothing.

Is there a way of "proving" the problem lies with 

https://www.maltasupermarket.com/

 so they will believe it's not at my end? (Or perhaps it is?!)

Edited July 5 by AdvancedSetup
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[ceckelberry]

@fonebone this is a false positive. You can safely allow this. We will allow on our side as well