cname-trackers

Note that CNAMEs is literally caused by GDPR, and the pathway every single ad or tracking company seems to go sooner or later. For people not understanding how it works: you can set a CNAME entry on your tracker.domain.tld to bypass all Browser's third-party tracking preventions, and make it look like it's a normal subdomain of your website. You need to make a CNAME tracker database manually by resolving the reverse entries for known IPs. Usually there is hundreds or thousands of CNAME entries pointing to the same IP address. The AdGuard team also made a database for this, in case anyone needs it for UBOL [1] Most, if not all of those trackers use assets that they serve from there (like a tracking pixel gif socket), so I highly doubt that uBOL will catch those; because the cat and mouse game is now in the ad tracker's favor and it is impo

EasyPrivacy gets a lot (most?) of the CNAME-cloaked stuff even on Chrome and MV3 because of efforts to detect and incorporate the subdomains into filter lists. AdGuard's public DNS server watches for CNAME cloaking and the subdomains get pushed to a list [1]. Or one could set their DNS to AdGuard and get the CNAME blocking in real time without filter list updates. uBO on Firefox is of course the more flexible solution but along with cosmetic filtering, this kind of thing would make it hard to notice the difference between a really good MV3 blocker and uBO on Firefox. [1] https://github.com/AdguardTeam/cname-trackers

> 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...