Well, it appears broken for me... But I don't have any errors in the logs.
Firefox 65.0.1 (64bit), Linux (5.0.0).
There are a couple warnings about a particular extension:
> warning: extension `GL_ARB_gpu_shader5' unsupported in fragment shader
The rest just appears to be successful parsing messages.
(But it worked really well in Konqueror & Chromium, so that's something.)