Yes, our Firefox support has not been great, but we are working on making it better: https://github.com/jitsi/jitsi-meet/issues/4758
> Desktop sharing? Chrome plugin.
This was a browser limiation, which is no longer needed since about 2 years ago.
> Desktop client? Chromium/Electron.
You need to ue it! Use the browser, or the mobile apps.
You're right that screen sharing does seem to work in Firefox! Thanks for pointing that out. It looks like FF on my Linux box is blocking it, but I guess that's a permission issue I need to fix locally.