User getting this pop-up box on a form but is unable to press the X on the top right to close, if they refresh the page, they will lose the data on the form.
What to do? Also, where does the icon in the centre come from?

User getting this pop-up box on a form but is unable to press the X on the top right to close, if they refresh the page, they will lose the data on the form.
What to do? Also, where does the icon in the centre come from?

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