[yardshop]

A lot of the text animation on that site does not seem to work in Firefox.

The three-D cube of letters on top is supposed to be in a range of weights and styles. On Firefox they are all the same. You can still drag the cube around with the mouse but the characters don't change as they do in Chrome.

The font selection drop downs change the font in many of the features on the page, but this doesn't work on Firefox either. I'm trying it the latest developer version.

There are a lot of sliders and pointer-dragging features that immediately change the text characteristics but none of this cool stuff works on Firefox. At the bottom it says "Made by friends of Google Fonts", maybe that's an indication of their browser alignment.

[pygy_]

The page actually works perfectly here in Firefox (v70 and v68esr through Tor, on a retina Mac).

The animation is actually smoother in v68, which is surprising given that IIRC v70 is supposed to make better use of hardware acceleration.

The drop down works fine too.

[mceachen]

I'm on Firefox on Android 9. The cube and all font weights and styles rendered as expected.

Kudos to the FF team!

[helb]

Everything you mentioned works for me in Firefox 70.0.1 (regular release, not developer version).