From the Firefox “Future Releases” Blog:
In the near future, Firefox will — by default — protect users by blocking tracking while also offering a clear set of controls to give our users more choice over what information they share with sites.
Over the next few months, we plan to release a series of features that will put this new approach into practice through three key initiatives:
Long page load times are detrimental to every user’s experience on the web. For that reason, we’ve added a new feature in Firefox Nightly that blocks trackers that slow down page loads. We will be testing this feature using a shield study in September. If we find that our approach performs well, we will start blocking slow-loading trackers by default in Firefox 63.
In order to help give users the private web browsing experience they expect and deserve, Firefox will strip cookies and block storage access from third-party tracking content. We’ve already made this available for our Firefox Nightly users to try out, and will be running a shield study to test the experience with some of our beta users in September. We aim to bring this protection to all users in Firefox 65, and will continue to refine our approach to provide the strongest possible protection while preserving a smooth user experience.
Deceptive practices that invisibly collect identifiable user information or degrade user experience are becoming more common. For example, some trackers fingerprint users — a technique that allows them to invisibly identify users by their device properties, and which users are unable to control. Other sites have deployed cryptomining scripts that silently mine cryptocurrencies on the user’s device. Practices like these make the web a more hostile place to be. Future versions of Firefox will block these practices by default.