When i use (and by inference... sign into Mozilla) i have a toolbar with several bookmarks - that are specific to my usage. In a way, you could say they are private to my sessions (not specifically the one i am in, but on a recurring basis) and should not be available to others... When I sign out of Mozilla (either manually or as an optional default for when the browser is closed...) I want the bookmark tabs on the toolbar to also go into storage. -->Is this possible (how?)

How sync'd devices are handled is another discussion For now.... let's address this device as an independent connection.