Used to work fine until around a month ago. My boards don't show anymore and it also asks to make a new board which when I try to, it just says there was an error. Still happens after clearing cache and cookies. I tried uninstalling and reinstalling both the add-on and firefox. Happens in private windows as well. Happens on both windows and macOS. I'm using firefox 70.0 and add-on 4.0.91. I'll change the rating once it's fixed!