Issue Summary

After selecting a date in a Confluence Database in Firefox, the date picker gets stuck in the top left corner.

Steps to Reproduce

1. Open a Confluence Database in Firefox
2. Create a date field
3. Move the date field to the first field position 
4. Set a date in one of the cells
5. Observe that the date picker is stuck in the top left corner

Expected Results

The date picker closes

Actual Results

The date picker does not close:

Workaround

Use Confluence Database in a different browser