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I tried to see if letterboxing was enabled, but it didn't seem to make a difference.¹

Does anyone know whether they included this feature, and if so how to enable it?

1: https://browserleaks.com/javascript still detects my window size down to the pixel.

`privacy.resistFingerprinting.letterboxing` is currently a separate setting since it's still rough around the edges. Not sure if it works on Release, I have it set on Nightly.

Set the "privacy.resistFingerprinting" pref to "true"

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.

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