Lawrence Abrams reports:
A HTML standard called hyperlink auditing that allows sites to track link clicks is enabled by default on Safari, Chrome, Opera, and Microsoft Edge, but will soon have no way to disable it. As it is considered a privacy risk, browsers previously allowed you to disable this feature. Now they are going in the opposite direction.
Hyperlink auditing is a HTML standard that allows the creation of special links that ping back to a specified URL when they are clicked on. These pings are done in the form of a POST request to the specified web page that can then examine the request headers to see what page the link was clicked on.
Read more on BleepingComputer, who reports that Firefox disables hyperlink auditing by default and currently has no plans to enable it. If you are concerned about your privacy, think about using Firefox already while everyone starts yelling at other browsers to get their act together to be more privacy protective.