They are not enabled by default, but Mozilla plans to eventually have them turned on automatically in all versions of Firefox.
Mozilla has worked together with Disconnect to identify domains that serve these fingerprinting and cryoptojacking scripts.
You can enable these security tools in Firefox Nightly 68 and Beta 67 by going to the Firefox main menu > Preferences > Privacy ad Security, selecting Custom under Content Blocking, and checking Cryptominers and Fingerprinters.
Original article