Re:Firefox 67.0 Released
by mbrubeck on Tuesday May 21, 2019 @09:45AM
(#19970053)
Set the "privacy.resistFingerprinting" pref to "true"
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I had that setting set to true since before the update.
Every site that mentions letterboxing claims this is the setting to use to enable it.
However, unless I misunderstand, it does not seem to enable it.