when syncing your Browser/device, Firefox seems to just Sync the tabs - out of order and no pinned status
and not only that the recovery/opening of said tabs is a manual process one by one
so my suggestion would be an option to sync the tabs in detail - e.g. pinned status and the order
and to allow - by one simple click - to restore said tabs (e.g. google chrome allows that and simply opens said set of backup in a new window