We will block the practices described above when the party using them is classified as a tracker. We [https://wiki.mozilla.org/index.php?title=Security/Anti_tracking_policy&diff=1214837&oldid=1214836#Policy_Exceptions previously offered] a set of exceptions independent from tracker classification, but as of July 9, 2019 we will no longer grant new exceptions. We will stop honoring the current set of exceptions in a future version of Firefox.
Questions about this policy should be directed to [mailto:antitracking-policy@mozilla.comantitracking-policy@mozilla.com].