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Por qué no aparecen los iconos de cerrar, minimizar y restaurar?

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No se muestra en la ventana los iconos para minimizar, restaurar y cerrar version de FireFox: 57.0.2 version del SO: Windows 7 Enterprise

No se muestra en la ventana los iconos para minimizar, restaurar y cerrar version de FireFox: 57.0.2 version del SO: Windows 7 Enterprise
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¡Hola José!

Por favor revisa https://support.mozilla.org/es/kb/como-puedo-actualizar-los-controladores-de-mi-tarj y dinos si esto resuelve tu pregunta.

¡Gracias!