What's the best way to circumvent this? Is it even possible?
I'm no expert (which is why I ask), but I assume that blocking third-party cookies in your browser won't prevent situations like the tracker example the author provides.
That is, since you visited tracker at least once, their cookie would have been set during that visit as a first-party cookie, and therefore the http requests to retrieve the 1x1 transparent image from their server will contain the data they're after, right?
I'm no expert (which is why I ask), but I assume that blocking third-party cookies in your browser won't prevent situations like the tracker example the author provides.
That is, since you visited tracker at least once, their cookie would have been set during that visit as a first-party cookie, and therefore the http requests to retrieve the 1x1 transparent image from their server will contain the data they're after, right?