I keep having to look up the definitions for CSS border radius when it comes to supporting the Mozilla and Webkit specific styles. I'm pasting this here for easy reference.

-webkit-border-radius: 6px;
-moz-border-radius: 6px;
border-radius: 6px;

-webkit-border-top-left-radius: 6px;
-webkit-border-top-right-radius: 6px;
-webkit-border-bottom-right-radius: 6px;
-webkit-border-bottom-left-radius: 6px;

-moz-border-radius-topleft: 6px;
-moz-border-radius-topright: 6px;
-moz-border-radius-bottomright: 6px;
-moz-border-radius-bottomleft: 6px;

border-top-left-radius: 6px;
border-top-right-radius: 6px;
border-bottom-right-radius: 6px;
border-bottom-left-radius: 4px;