If it's buried in about:config, it's not a feature, it's just a dev tool. (FWIW, I read that config settings may reset during updates, so at best it's just a temporary patch.)

It's like saying you have a responsive website, but only if I edit the layout in the DOM.

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cassepipe 8 hours ago | parent [-]

Nit: It's not a parameter in about:config, it's been available for a while under about:profiles, no tweak needed

	▲	dare944 8 hours ago \| parent [-]
		And now they're rolling out a new UI for it: https://support.mozilla.org/en-US/kb/profile-management