With Firefox 36.0.1 WebGL is working again. In Firefox 35.0.1 (released January 26) support for the EXT_blend_minmax WebGL extension was added, but at the same time something with additively blending on floating point textures had stopped working, you can read about it our blog.
Firefox 36 was released on February 24th, 2015. There are also other new features implemented in Firefox from WebGL 2.0 specification, like WebGLQuery. So we are hoping fast developments with WebGL and 3D in browsers.