(In reply to Ulrich Windl from comment #16) > Created attachment 856138 [details] > Screenshot from Firefox 91.6.0 ESR (partially redacted) > > Downloaded Mozilla's Firefox ESR 91.6.0: Still presentation (screen sharing) > does not display. Thanks for checking. Then it is not an openSUSE bug, but a Firefox bug (or webex bug). Would you mind opening an upstream bugreport at https://bugzilla.mozilla.org/ for it?