Border Radius Not Working in Firefox

https://chocolateandcarrots.com/blog for reference.

I have added the code:

#content img {
	margin: 0;
	max-width: 640px;
	-moz-border-radius: 10px;
	-webkit-border-radius: 10px;
}

For some reason, the rounded borders render fine in Chrome, but not in Firefox. I also have the following code for the wrapper and the border renders fine in Firefox:

#wrapper {
	margin-top: 20px;
	background-color: #fff;
	padding: 0 20px;
	-webkit-border-radius: 20px;
	-moz-border-radius: 20px;
}

Any help? I’m at a loss.