Browser vendors don’t control drivers or hardware support on the different OSs. VR is pretty much a Windows game today with limited and experimental Vive support on OSX and Linux. I’m sure that Mozilla in particular is eager to support linux.
Oculus GO is an Android system. No Windows involved. Unfortunately it has replaced the operating system with a shopping mall. You want that free Firefox download? Log-in to Facebook first. Every apk has to go over the shop, no sideloading. Which is a shame - would be a nice system if it only were more open.
