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Re:Firefox 67.0 Released by mbrubeck on Tuesday May 21, 2019 @09:45AM (#19970053)
Set the "privacy.resistFingerprinting" pref to "true"
Re:Firefox 67.0 Released by gerbilly on Tuesday May 21, 2019 @09:50AM (#19970106)
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.