Online privacy is facing a new challenge: A first-party tracker that appears to be unblockable with standard privacy tools such as adblockers. The tracker in question was spotted being deployed by French national newspaper, Liberation, which in October promised subscribers an entirely tracker-free experience. That promise garnered it a bunch of attention from privacy experts who dug around and found a first-party tracker embedded on its site which uses a subdomain (that’s mostly random) in order to redirect to a third party — thereby making it difficult to block (i.e.