I saw there was a beta. The FreeRDP plugin doesn’t work quite right for me yet. (No criticism; I know this is just a beta.)
When I connect (according to the log: successfully), I get a little titlebar in the bottom-left of the tab with the hostname of the connection. But the rest of the tab is blank, and I can’t close the tab. Or the window. I have to force-close from Task Manager. I’ve dropped back to the Windows RDP plugin for the moment.