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xulrunner is already running, but is not responding

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I use Firefox 63.0.3 to run a XULrunner demo which from matthewkastor ( url: https://github.com/matthewkastor/XULRunner-Examples )

with the command line : "C:\Program Files\Mozilla Firefox\firefox.exe" -app C:\helloWorld\application.ini

when i first start the application and close the app's window by click "X" button, the app's window exit but the firefox process which contain xulrunner demo remain.

thus, when i start the app twice and found the error message like this:

helloWorld is already running, but is not responding.The old Firefox process must be closed to open a new window.

How can I fix it? thanks for any response.

I use Firefox 63.0.3 to run a XULrunner demo which from matthewkastor ( url: https://github.com/matthewkastor/XULRunner-Examples ) with the command line : "C:\Program Files\Mozilla Firefox\firefox.exe" -app C:\helloWorld\application.ini when i first start the application and close the app's window by click "X" button, the app's window exit but the firefox process which contain xulrunner demo remain. thus, when i start the app twice and found the error message like this: helloWorld is already running, but is not responding.The old Firefox process must be closed to open a new window. How can I fix it? thanks for any response.