Level 63
Content Creator
Malware Hunter

On February 19th, 2020, uBlock Origin 1.2.5 was released and allows the ad blocker to block these cloaked tracking scripts by performing a DNS lookup before loading them.

If the subdomain is a CNAME to a third-party host, then uBlock Origin will block the script from loading.

When cloaked first-party trackers are blocked, they will appear in the log as blue entries with the uncloaked domain shown underneath in a smaller font.
Uncloaked first-party trackers

Uncloaked first-party trackers
Unfortunately, the DNS API that allows DNS lookups is only available for Firefox, so Chrome users are out of luck and cannot take advantage of this feature. [....]