Quoting Steve Litt (slitt@???):

> So while a home-grown installation is all of our goal, until then,
> anything on meet.jit.si works pretty darn well, as long as your browser
> is Chromium if you're on Linux.

Looks like Jitsi Meet's supported browsers list has moved to
https://jitsi.github.io/handbook/docs/user-guide/supported-browsers and
been updated (2021-03-05, i.e., today).

Firefox and Safari (versions unstated; recent isimplied) are now on the
supported browsers list, as are in general mobile-device Web browsers --
the main problem case remaining being Web browsers for iOS, which was
not possible before iOS 14.3 as the OS did not allow WebRTC, (Jitsi
Project say they are now checking out such browsers now that OS support
is there.)

That supported browsers list of course implies a server running a recent
release of Jitsi Meet. Obviously meet.jit.si does; third-party servers
might or might not.

Alternative client options include bespoke Jitsi Meet clients for iOS
and Android and the Electron-based bespoke desktop Jitsi Meet client.