uBlock Origin 1.2.5 has been released with a new feature that blocks first-party tracking scripts that use DNS CNAME records to load tracking scripts from a third-party domain and bypass filters.
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.
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. [....]
Uncloaked first-party trackers