zero bookmarks on my firefox browser (on desktop and on laptop)

I have just installed the extension on all my browsers in desktop and laptop, and begun syncing through chrome on desktop (it was the most updated version of my bookmarks). Then, i tried to sync on firefox by downloading the full set from the app's servers, but all it did was delete my firefox's bookmarks. Nothing will work, except to restore bookmarks to old its old version, which do not contain all i need.