Hi! As we mentioned in the recent Quest release blog post, https://blog.mozvr.com/firefox-reality-for-oculus-quest/, we have some designs for multi-window support and synchronization of content between platforms. We're still working on options around tabs / additional content beyond the number of windows you have open, alongside our really awesome Seattle-based design partners, Podipo: http://podipo.com/

Once we have some concrete designs, we'll have issues open and on our public roadmap for comment and we often have early builds available in our releases page for sideloading if people are interested in testing and giving feedback.