This is kind of the opposite I think. Your browser is blocking assets, probably at your request. Mine is too btw.

That's weird I was about to disagree with you but then I refreshed the page and had the same problem. The debug console showed a lot of content security policy violations for inline scripts.

After some more refreshes it came back. The bug seems intermittent and thus not easily reproducible.

Same here, but it worked the second time, with FF mobile.

I bet there's some race condition somewhere that goes away when whatever file is cached and loads quickly.

Works fine for me with FF 67.0.2 on a current Android 9 image. Are you sure it's not something else?

Turns out it was the tracking protection which blocks some google domains.

Disabling tracking protection for this site (there were 9 of them) worked

Unblocking third party javascript worked for me. That's still idiocy if you'd ask me, but doesn't seem to be google-specific idiocy.

You are right. Disabling tracking protection worked

What did you expect to happen with the endless feature chasing?

Not true. Works fine for me.