Not for me (android firefox). If webGL uses facilities not available on your GPU, it well doesn't work. That's likely it, and we've just not seeing the error message.
e.g. my phone lacks float textures (i.e, to render-to-texture to output floating point calculations), so this fluid simulation doesn't work http://jamie-wong.com/2016/08/05/webgl-fluid-simulation/ (not a guess; I've been through the source, reimplemented some in java)