I've noticed in the Ubuntu versions of Firefox, the latest versions of Firefox, you sometimes have to go in to Preferences and on the General page, you have to check mark, "Play DRM-controlled content". Though not a guarantee but maybe that will help.
I know DRM content can be a pain on some websites but in Linux Firefox, you have to enable it for it to work in some cases.
CGato
Just tried the preferences in the lastest Firefox.
Did the same thing: acts like it recognizes the provider, shows current live features.
As soon as I click on one, the flash video screen spinner acts like it is going to load, but the spinner just spins.
I have searched some of the Linux help forums and that seems to be the likely result. It is funny that NBCSports will play, but FoxSportsGo won’t.