[cookiengineer]

> uBlock Origin already performs CNAME decloaking and blocks this approach, it’s pretty cool.

... which in return is a static list of domains which needs to be regularly updated, and therefore is not really failsafe. uBlock0 uses Adguard's scraped dataset [1] as a fallback source to do this, as Chrome Extensions cannot make DNS requests without a DNS-via-HTTPS endpoint.

Firefox, however, has provided the `dns` API [2] to do requests via the native OS resolver (which in return is also not failsafe due to being unencrypted plain-old-manipulateable DNS UDP requests)

[1] https://github.com/AdguardTeam/cname-trackers

[2] https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...