@DelphineM Firefox seems to lack some WebRTC features. The side-effect seems to be that there are performance issues on all participants when at least one is using Firefox.

Here is for example an article in French: https://linuxfr.org/users/space_e_man/journaux/jitsi-denigre-firefox-et-decredibilise-des-logiciels-libres

@KillianKemps Thanks