Very interesting. Having looked at NoScript it seems like you can disable LAN as a default value under the allow tab.

Looking further

* uBlock Origin and Lite have it as an option under Filter List > Privacy > Block Outsider Intrusion into LAN

* Brave prevents it, tested with Aggressively block Trackers and Ads.

	▲	codedokode 2 days ago \| parent [-]
		Why do you need a heavyweight extension to block sites from scanning your local network? Ridiculous. Also I wonder if this protection is available only with old extension manifest version or new network request hooks API also supports it.