[aledue]

Temas refuses(ed?) to let you hear voice calls if you use Firefox. It's the only reason I have Chromium installed too.

[bravetraveler]

If my experience forcing WebEx in the past has taught me anything, it should be a matter of webRTC features and user agent

[nunez]

there’s a plug-in that tries this; it kind of works but won’t allow you to make calls for whatever reason

[benjamir]

Until recently Firefox releases had all kind of problems (e.g. hardware enumeration) That's why we recommended Chromium/Chrome for at our faculty for Jitsi usage

I'm a Firefox (beta) user myself, but I would rather try another browser before blaming a webapp -- many issues.