I’m not exactly sure if this ever worked or when it started breaking, but video textures seem to have errors on Firefox for Android. Below is the GL error / warnings spit out by Firefox Dev Console:
And the result is that the material returns black to the fragment shader.
I’ve tested these web pages on Firefox for Android with the error described above:
I will cross-post this with Firefox as it may be a GL error on the vendor’s side. (Updated: Ticket)
Hardware Requirements (graphics card, VR Device, …)
Tested on a Pixel (first generation).