Toast not being read by screen readers in Firefox

[paulGeoghegan]

It doesn't seem like toast messages are being read in FF. I'm using the latest version of NVDA and when I show the toast it just says alert but if I do this in Chrome it works fine. I checked the demo on the website and that works fine in FF so I'm not sure if there is a difference in versions there. I'm running the latest version of French Toast and just installed it in a project.