Official Source : Mozilla Hacks
With the release of Firefox 51, WebGL 2 support has landed! WebGL is a standard API to render 3D graphics in the Web. It is based on OpenGL ES, which is commonly used by mobile games.
To date, we have been able to use WebGL 1 (based on OpenGL ES 2) to render fancy graphics into a <canvas> element. WebGL 2, however, is based on the OpenGL ES 3.0 specification, which introduces new features – many of them aimed at increasing performance and visual fidelity.
Until today, WebGL 2 had been usable behind a flag or in the Developer Edition or Nightly, but with Firefox 51, it’s now unlocked for all users of Firefox on Windows, MacOS, and Linux.
Demo: “After the Flood” (PlayCanvas)