JIRA Attachment Download

Works with old JIRA issue view (which already has Download All in the Attachments "..." menu), but does not work with new view (says "This is no JIRA ticket." when clicked). So to use this extension, you can turn off "New JIRA Issue View" in JIRA settings, or click "See the old view" at the top of the issue page before clicking the button. Note that JIRA's Download All gives you a .zip file, while this extension downloads individual files, so it's useful when you don't want a .zip.