Your browser does not support grid, so will not be supported. Hover over your browser version to see if there is a way to enable potential support. Sorry, I am no longer able to justify working on making the layout work on older devices.
To be honest I prefer the original framerate over 60 fps for most hand drawn animation, even if they use ffmpeg because it still just looks wonky. Got a link/source for that "30 fps" version?