I ran it both in Chrome and Firefox, seems to be working. Could i bother you for error 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.)
Safari and Chrome both had to work around the same thing, so it seems like there's some contention around who is to blame here.
Either way, three.js is (partially) broken for Firefox users.