**Bug**: (Firefox) Select with multiple attribute double click

### What is the current behavior?

In Firefox a value of the MulitSelectBox component is not selected with the 1st click.
Example taken from the React Final Form website:
https://final-form.org/docs/react-final-form/examples/simple

### What is the expected behavior?

Item in MultiSelectBox is selected after first click in Firefox

### Sandbox Link

https://final-form.org/docs/react-final-form/examples/simple

Start by reproducing the issue in Firefox using the linked React Final Form simple example and inspect the MultiSelectBox component's click and selection behavior. Confirm that an item selected with one click remains selected, matching the expected behavior described in the issue.

Written by the indexing model from the issue text.