We're currently exposing this in Nightly and Dev Edition. It's an old and long deprecated API (see Bug 1635867). Anyone using this API is probably capable of finding the pref and turning it on, but having the API available means that we have an expanded fingerprinting surface for no real gain.
Bug 1750902 Comment 0 Edit History
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We're currently exposing this in Nightly and Dev Edition, plus Windows and Mac. It's an old and long deprecated API (see Bug 1635867). Anyone using this API is probably capable of finding the pref and turning it on, but having the API available means that we have an expanded fingerprinting surface for no real gain.