(Sharp readers may have noticed I've said very little about SunSpider times, although they are similarly affected. That's because I'm doubtful Mozilla is optimizing much for them anymore and they are now practically microbenchmarks on modern CPUs. What benefits the V8 benchmark does not necessarily benefit SunSpider, but I'm not sure that the latter is necessarily salvageable at this point. We'll see.)
Video and audio support through getUserMedia is, as previously mentioned, fully supported for the moment. NB: I haven't decided if this will be supported for certain in TenFourFox 24 -- it depends on whether Mozilla or Google guts our QuickTime C API support along the way. For now, it is. I tested it with my iSight FireWire camera, which worked, and my Orange Micro iBOT, which didn't. Please try it with your Mac's devices on the test page and post your experiments to the video support wiki page. I'll make reasonable efforts to support devices that are not technologically constrained, but no guarantees that your favourite device will be one of them, of course.
The port for 21 will start with beta 2, as usual.