The site looks mostly OK under Firefox, but the <canvas>es are rendering at (I believe) 50% of their intended height. This results in graphics on there being sm

The site looks mostly OK under Firefox, but the <canvas>es are rendering at (I believe) 50% of their intended height. This results in graphics on there being smudged and distorted, looking twice as wide as they should be. I'm on a HiDPI/Retina display, for what it's worth.