We should drop the -moz prefix, or, depending on how far backwards-compatible we want to be, keep the -moz prefix and add -webkit as well as unprefixed. For this particular page I'd be happy to go with unprefixed only and older browsers can fall back to the solid color.

We also have a mixin for gradients that produces an exhaustive list if you want to be super-thorough, but it's kind of overkill. https://github.com/mozilla/bedrock/blob/master/media/css/sandstone/lib.less#L237