Latest JavaFX 21 user agents:

User Agent Platform Device
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/619.1 (KHTML, like Gecko) JavaFX/21 Safari/619.1 Windows 10 Unknown
Mozilla/5.0 (Macintosh; PPC Mac OS X) AppleWebKit/616.1 (KHTML, like Gecko) JavaFX/21 Safari/616.1 Mac Unknown