Actually, it seems to be to implement the "Contacts API": https://bugzilla.mozil...

		rockdoe on July 13, 2015 \| parent \| context \| favorite \| on: Firefox, you're supposed to be in my pocket, not t... Actually, it seems to be to implement the "Contacts API": https://bugzilla.mozilla.org/show_bug.cgi?id=857730 https://hg.mozilla.org/mozilla-central/rev/1d77c3062662 Note that it's only enabled in Nightlies with no plans to ship.