download sync
ive synced firefox over the years bookmarks passwords etc i sold my pc bought a new one a year later logged into firefox sync i can see my previous sync's in account management devices but all of my things arent coming back none of my passwords or bookmarks are showing from before
Alla svar (1)
One year is a long time for a Firefox Account to sit unused. Sync was never intended to store a users data for the long term; the idea is to keep the users data updated every time they open Firefox on one of their connected devices. You made no mention of a 2nd device being used with the PC which was sold.
I have a hunch there's more to your problem than what you have stated thus far.