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What does nsAppShell: Event Window mean?

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Many times when I attempt to close windows xp pro I get an error message saying (What does nsAppShell: Event Window). What does it mean? It prevents the closing of xp, and the pc continues to run.

Many times when I attempt to close windows xp pro I get an error message saying (What does nsAppShell: Event Window). What does it mean? It prevents the closing of xp, and the pc continues to run.

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cor-el
cor-el
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See "Hang at exit":

See "Firefox hangs when you quit it":