https://techcrunch.com/2019/02/24/microsoft-promises-an-open-hololens-ecosystem/

At its MWC keynote in Barcelona today, Microsoft promised to keep the HoloLens ecosystem open. That means third-party app stores and browsers, for example, with Mozilla already announcing its Firefox browser for HoloLens today.

“Developers will have the freedom to create their own stares as first-class citizens,” Microsoft’s HoloLens chief Alex Kipman said today and stressed that developers will also have the freedom to create great web browsers.