As part of the Tor uplift project, we are going to implement anti-fingerprinting protection  in Firefox. This bug is used as the meta bug of all anti-fingerprinting features. Reference:  Cross-Origin Fingerprinting Unlinkability https://www.torproject.org/projects/torbrowser/design/#fingerprinting-linkability
Fingerprinting defenses work best when they are used together. Therefore an idea we have proposed is to make all anti-fingerprinting features active when the pref "privacy.resistFingerprinting" = true. That will make it easier for users to activate all anti-fingerprinting features at once, and also will give a simple definition of what is included in Firefox's fingerprinting resistance so that we can measure our progress using tools such as https://panopticlick.eff.org/. Also, Tor Browser will enable this pref.