The TSL4 player has a few problems for me in firefox. It doesn't move when snapping the windows to side or back to full screen, meaning it ends up being cut off, with no way to re-center it or scroll across. When using the lower settings, it also moved across just within the vod player window, which meant the fullscreen button wasn't accessible and had to start the whole thing up again to watch it properly.
Glad it's up with the spoiler-free setup though! Just finished the Major series and loving it