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Re:Firefox 85 cracks down on supercookies by ogre_codes on Tuesday January 26, 2021 @11:35AM (#25917797)
Yup.

The really frustrating thing about this bit is that because it disables optimizations, it potentially impacts sites where they don't actually use tracking.

Re:Firefox 85 cracks down on supercookies by sanxiyn on Tuesday January 26, 2021 @11:54AM (#25918101)
Note that this particular change does not apply to non-third-party resources. That's why performance impact is minimal.