Works just fine for me.

Appreciate the heads-up — Which version and OS? And is it all of the interactive demos, or only some of them?

Tried on two Macs:

- Firefox 90.0.2 (64-bit) (Intel) and macOS 11.5

- Firefox 90.0.2 (64-bit) (Apple Silicon) and macOS 11.5.1

Tried private window with no extensions as well and still no dice. All interactive demos. Nothing happens when I manipulate the sliders.

Interestingly this works fine when I click around the options [0]

[0] https://developer.mozilla.org/en-US/docs/Web/CSS/transform

Same here. 91.9b9 and Win 10. I'm not sure any of them are.

Same here, V90.0.2 Windows 10