I honestly don't know what important data you might have been storing or how, but passwords are definitely one thing that is still synchronized between all your FF instances.
Profile sync is so deeply tied into the browser that ripping it out to abandon it would likely be more costly than just keeping those servers running forever, I think. As long as FF lives, it will keep that sync going.
Any new "external" feature is another matter, of course.
Comments
I honestly don't know what important data you might have been storing or how, but passwords are definitely one thing that is still synchronized between all your FF instances.
I know it’s there now. But when will it end? Same argument goes for Send and other services.
Profile sync is so deeply tied into the browser that ripping it out to abandon it would likely be more costly than just keeping those servers running forever, I think. As long as FF lives, it will keep that sync going.
Any new "external" feature is another matter, of course.