21
What does firefox.settings.services.mozilla.com domain do?
(sh.itjust.works)
A place to discuss the news and latest developments on the open-source browser Firefox
It's used to check for website breaches. From How to stop Firefox from making automatic connections:
Firefox Monitor warns you if your online accounts were involved in a known data breach. For more information, see Firefox Password Manager - Alerts for breached websites.
To get the latest login breach information and more, Firefox connects to firefox.settings.services.mozilla.com
To disable, see here.
Thanks