It has terrible Firefox support but works decent if all participants are using Chromium / Chrome[0]. Asking other people to install Chromium makes me feel dirty but I don't know any other login-free cross-platform open source easy-to-use video conferencing apps than Jitsi Meet.
It does tell you that Firefox is not supported when you log in though, so I'd have expected people to say something but hey ho...
Zoom is unencrypted by default? So you have to physically turn encryption on. Also, it is very unclear if your data is encrypted at rest. "End to end encryption" does not necessarily mean "end-to-end encryption" as has been shown many times before