Clipboard managers are needed at least on some desktop environments to make copy/paste functional between applications. On my XFCE 4.12, with clipboard manager

Clipboard managers are needed at least on some desktop environments to make copy/paste functional between applications. On my XFCE 4.12, with clipboard managers, if I copy from, say, Firefox, then close it, the content of the clipboard disappears. If it's the same with Wayland, then having a functional clipboard manager is a big deal (at least, as much as such copy/paste operations are).