sync collections

Have installed Firefox on Windown 11 PC , Android mobile and Android tablet. Bookmarks seem to sync across devices but i like the speed dial feature as used on Vivaldi. This only appears to work on desktop as an add on but doesnt sync to the Android devices. I then discovered Collections on my Android phone which seemed ideal. Set it up and then found it didnt sync to any of the other devices. Can this be done. If not going back to Vivaldi. Very dissapointed as it seems to be a really fast browser.