Firefox on Manjaro XFCE: crash on logout, shutdown or restart

On two computers I have Manjaro XFCE.
Firefox is version 79.0.

On logout and restart or shutdown, Firefox show a message, that it has crashed.
This does not occur on Manjaro KDE (one computer).

Yes same here. But don't have any effect. When you shutdown or restart without saving and closing the app, it will be killed. It just display that it is crashed because you killed it. ^^

Then Firefox was killed by GUI.

Who wants the solution button ?

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