Seems like the streaming services have caught up with Firefox. For years, it was possible to use Virtual Desktop and stream movies and shows from Disney +, Prime Video, Netflix etc to a Quest headset - but now, after a few Firefox updates, all these streaming sites just display black screens when playing content. The workaround for now, is to downgrade Firefox to version 119, which you can get from
here.
Quite sad really, because there is no SA version of the Disney + or Prime Video Apps for Quest 3 and the official Netflix App is quite outdated and only streams at 480p. Hopefully when Apple's Vision Pro hits the market then these streamers will get a kick in the pants and make some VR apps for the various regions.