Webex seems not to be supported any longer at Linux at all?

[spielkind]

Just get this Error when I try to start a "Testmeeting": https://www.webex.com/test-meeting.html#

Your browser, browser version, or operating system is currently unsupported
For details, check the system requirements

[fgsch]

I have not used this for a while but I just tried and it looks to be the case.
I will keep poking it but it might not be possible to use it anymore.
Have you tried the chrome extension?

[spielkind]

I did without luck, latest firefox with chromeos & ff as useragent works a bit (no own sharing possible).