Why Bluhell Firewall blocks this address in firefox?

Going to resource://bluhellfirewall/blocked.xhtml?t=939ede5e-1919-4005-8eed-97a28a2a4fca&h=d3d3LmFkLm5s&u=aHR0cDovL3d3dy5hZC5ubC8= delivers a block. DNS Secured, trying to go to: www.ad.nl/ → http://www.ad.nl/?BHT-1707f7c8-f7b0-463d-9d3d-800242ec1b91.0

Why this block? Anyone? Message from Bluhell FW

While it might be harmless, we prevented you from accessing this page as part of our active protection. If you trust that domain, click “Toestaan*” to go straight to the page.

However, keep in mind that even a safe-looking domain could hide a potentially harmful website using Click-through techniques behind it.

polonus