Summary

Unable to generate an export of 'Portal only customers' using the Firefox browser

Steps to Reproduce

1. Login to the instance on the Firefox browser (standard browsing mode or private window)
2. Navigate to 'Jira Administration > User Management > Jira Service Desk > Portal only customers'
3. Click on the 'Export users' button

Expected Results

1. File should be exported successfully

Actual Results

1. No prompt saying that the file was exported and is ready for download
2. No download file in the Downloads folder
3. A busy 'spinner' appears next to the button for a few seconds
   

Workaround

1. Use a different browser, e.g Google Chrome