Firefox 55 rolls out today, and one significant addition is WebVR. While Mozilla is a little late to the party (Chrome and Edge already include this functionality), Windows users who have an HTC Vive or Oculus Rift headset can now experience VR without having to download Firefox Nightly. The API was originally conceived in 2014 and allows browsers to detect, query, and poll the relevant hardware.
We are delighted to announce that WebVR will ship on by default for all Windows users with an HTC VIVE or Oculus Rift headset in Firefox 55 (currently scheduled for August 8th). WebVR transforms Virtual Reality (VR) into a first-class experience on the web, giving it the infinite possibilities found in the openness and interoperability of the Web Platform. When coupled with WebGL to render 3D graphics, these APIs transform the browser into a platform that allows VR content to be published to the Web and instantaneously consumed from any capable VR device.
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Source: [H]ardOCP – Mozilla Brings Virtual Reality to All Firefox Users