Mozilla supports a number of extensions to CSS that are prefixed with ‘-moz’. These include a number of capabilities, including rounded borders, and the ability to specify different box width and height calculations to more easily support browers that perform such calculations in a non-standard way.
Some of these properties have subsequently been proposed for inclusion in the CSS specification, though the standard property may be different from the -moz implementation.
Some of these nonstandard properties apply only to elements with XUL display types.