Mozilla announced that is creating a new browser called "Firefox Reality".
Firefox regular version only supported the WebVR, while the new browser is especially
designed for AR (Augmented Reality) and VR (Virtual Reality) headsets.
The company blog says,
The company want's to extend support for AR (Augmented Reality) and VR (Virtual Reality) headsets instead of being on the smart phones, tablets, and PCs.
Just like the firefox desktop browser it's an open source and its source code has already been released on GitHub here.
Mozilla have yet to be announce the release of "Firefox Reality".