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Set locale independent of language?

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I want my Firefox to be in English, but with either ISO-date and time or European date and time. Locale en_DK, preferably.

Is that possible? I'm on MacOS. Chrome doesn't seem to have a problem honouring the system settings.

Setting intl.regional_prefs.use_os_locales doesn't change anything.

I want my Firefox to be in English, but with either ISO-date and time or European date and time. Locale en_DK, preferably. Is that possible? I'm on MacOS. Chrome doesn't seem to have a problem honouring the system settings. Setting intl.regional_prefs.use_os_locales doesn't change anything.
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