Do I need to use these in my CSS

1 
.mainheader nav {
	background-color: #000000;
	height: 40px;
	border-radius: 5px;
	-moz-border-radius: 5px;
	-webkit-border-radius: 5px;
}

Was wondering if i need the -moz- and -webkit- part.

2

No, you don’t.
border-radius is supported without prefix: http://caniuse.com/#search=border-radius

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