While we are working hard to improve the testRTC backend and service, there’s also a lot of work that goes on to improving the availability of our service on as many devices as possible.
To that end, we’ve been hard at work in recent months to get testRTC to work with Firefox as well. We are at a point when the implementation is rather stable. While we do know of some issues we have with Firefox, we’d like to start collecting customer feedback about it – if you want to try it out, then do contact us about our private beta for Firefox.