Summary

Content added to the live region (filepond--assistant) is not read by screen reader (NVDA) in Firefox. This appears to be related to the aria-relevant="additions" attribute.

How to reproduce

Run NVDA and add, upload, or remove a file from filePond in Firefox.

Expected behaviour

The appropriate text is added to the aria-live="polite" element, and announced by the screen reader.

Currently, the text is added to the element, but the content is not announced.

Additional information

When the aria-relevent attribute is removed from the live region element, or the attribute is set toaria-relevant="additions text", Firefox will announce the status updates.

This appears to be due to one of several inconsistencies with aria-relevant across browsers. It is recommended to avoid this attribute if possible:
https://medium.com/dev-channel/why-authors-should-avoid-aria-relevant-5d3164fab1e3

A fix may be as simple as removing this attribute from the assistant element.