Firefox SingleDatePicker withPortal not usable

On Firefox the SingleDatePicker with the withPortal option triggers onFocusChange twice, once with { focused: true } and right afterwards { focused: false }. This makes the portal open and close in a matter of half a second, rendering the datepicker unusable.

import { SingleDatePicker } from 'react-dates';

export default ({ date, focused, onFocusChange, onDateChange }) => (
    <SingleDatePicker
      id="date_input"
      withPortal
      date={date}
      focused={focused}
      onDateChange={onDateChange}
      onFocusChange={onFocusChange}
      isOutsideRange={(day) => day.isAfter(moment())}
      displayFormat="DD.MM.YYYY"
    />
);

Reproduced on Firefox Developer Edition 53.0a2 and Firefox 51.0.1.

[majapw]

This should be fixed in v9.0.1!

[phamcharles]

@majapw thank you for your hard work and the quick turnaround. I really appreciate it!