When the standalone DevTools are opened without a running React application, this is what's currently shown:

Being able to use the standalone app without any connected clients, just to inspect saved profiles, would be a nice to have though. We should move the greeting message / instructions into the Components tab (when there's no connected apps) and let the Profiler be used to import previous profiles.

Note that doing this will likely require a new prop being passed to the outer DevTools component.