I have used Firefox on my laptop for years, and more recently on my Samsung phone and tablet. I have trouble syncing my laptop automatically and have seen the various forum answers addressing this, but I'm not really concerned about it because I'm content to sync manually as needed. But when I change my laptop bookmarks and sign in to sync, my laptop reverts to the earlier version, rather than uploading my new bookmarks. I therefore lose all my new bookmarks. I also receive a message that "A new device is now syncing with all of the devices connected to your Firefox Account", despite the fact that this is the same device I have used for years. How do I ensure that my laptop bookmarks are uploaded, so that my mobile devices sync to IT, rather than the other way round?