I have a static test version of my website available at this link:
However, when I open it in Firefox, the canvas does not resize properly. It seems that the issue lies within this line of code:
var _docHeight = (document.height !== undefined) ? document.height :
document.body.offsetHeight;
var _docWidth = (document.width !== undefined) ? document.width :
document.body.offsetWidth;
ctx.canvas.width = _docWidth;
ctx.canvas.height = _docHeight;
This code functions correctly in WebKit browsers, but Gecko appears to have trouble with it.