In 22.0 Mozilla also announced official support for teleconferencing through WebRTC. We should, at least in theory, be able to support this given a fast enough Mac. It may well be hopeless for almost all G3s, but I should think voice-only comms should work for most G4s, and the high end G5s might even be able to do video. I don't really want to announce WebRTC support until it's been tested, though, and my unusual network setup may be interfering with testing. I'd like to see how others do with the WebRTC demo -- go to the apprtc. link at the top and it will provide a connect URL for another user to connect to. Oddly, on my network, it simply connected to itself, but I have a rather unfriendly firewall and I suspect it is interfering with the peer-to-peer communication protocol. That said, my antisocial chat with myself in full video and audio proceeded at nearly full speed on this quad. Please post your testing results in the comments. If it appears to work well, then it will be officially supported in whatever the next stable branch happens to be.