Hey, Scribble Diffusion author here.

Sorry about the trouble. The Firefox incompatibility is the result of a bug in the underlying npm package we're using to render the drawing tool and canvas.

The issue is being tracked here: https://github.com/replicate/scribble-diffusion/issues/17#is...

We may need to wait for a fix to that, or consider swapping out the package we use for scribbling on a canvas.