Steps to Reproduce

https://zkfiddle.org/sample/1g0rvk1/2-Firefox-missing-rmdesktop-from-external-window#source-1

Download (fiddle has side effects on url) and run on a separate server, or with a latency proxy emulator.

Using firefox, click the button to open the app.zul page in a popup page from the main window.

Close the main window first, then close the popup.

Current Result

rmDesktop is not sent from clients side. (observed with pass-through proxy http recorder)

Expected Result

Firefox should notify end of desktop with rmDesktop, even from a popup

Debug Information

May be technology limit in FF with the current rmDesktop implementation. If so, still need to find a way to destroy desktops when orphaned.

Workaround

Use the Watchdog implementation from tracker ticket ZK-4194 to destroy tickets from server-side if connection is broken