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Using Nightly go to about:config and enable the media.navigator.enabled pref, then you can test it out at this page: https://people.mozilla.com/~anarayanan/gum_test.html

> Using Nightly go to about:config and enable the media.navigator.enabled pref, then you can test it out at this page

That's not support. Support is on the shipping main branch. Chrome has had support for a while too if you wanted to jump through some hoops.