Do I need to install an add-on to watch?

I love Firefox as much as the next web geek, but does it really need its own music festival? In Japan, it does, so reports The Firefox Music Festival ’07 happens Sept. 15 with a line-up featuring a number of indie bands, including SXSW alumni Tsu*Shi*Ma*Mi*re. (I do like the name MARS EURYTHMICS, though.) The concert is being webcasted. I wonder if you can view it on Safari and Opera. I’m not even bothering with IE.