Hi. Windows broke, had to be reinstalled the operating system. connected synchronization, but tabs are not loaded. how do I restore bookmarks from sync?
The Firefox Sync service is not a backup service, so it may not work for that purpose. While it's true that some people are able to recover bookmarks from Firefox Sync, those cases are rare and very much come down to luck.
However, if this is your only device that was connected to Firefox Sync, it's unlikely that you will be able to recover the bookmarks from Firefox Sync.