With Firefox's tracking protection on, the only thing I get for the homepage is a single line error message, as the WebGL context drops unexpectedly.
If you visit at least once without tracking protection, and then turn it back on, and visit (even with cleaning all caches), then the site loads correctly.
Considering the exact sequence of events to trigger it, I feel sorry that I found the bug. Seems like a really hard one to trace and debug. Almost feel like I should be apologising, rather than thanking you for taking a look!
If you visit at least once without tracking protection, and then turn it back on, and visit (even with cleaning all caches), then the site loads correctly.