I'm adding this info here because it does not appear anywhere else;

if you want to watch gog.com shows on windows twitch with firefox and be able to see any thing at all then you must have a flash player installed.

there are some other 3rd party options but I'll link the adobe player here because thats the best one
- https://get.adobe.com/flashplayer/otherversions/

note that wx users will have flash force install into Microsoft Edge but you need the extra install to use firefox instead.