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What does Firefox 3 mean in terms of CSS improvements? Mozilla has posted a definitive list on the http://developer.mozilla.org site.

"Firefox 3 offers a number of improvements to its CSS implementation. While these changes are documented on the appropriate pages in the documentation, this article provides an overview of them all so that developers can easily learn what these changes were."

• The display property’s inline-block and inline-table values are now implemented.
• The font-size-adjust property now works on all platforms; previously it was only supported on Windows.
• rgba() and hsla() support for color bug 147017 )
• :default pseudo-class support bug 302186 )
• -moz-max-content, -moz-min-content, -moz-fit-content, and -moz-available values have been added to width , min-width , and max-width bug 311415 and bug 402706 )
• HTML soft hyphens (­) are now supported.
• Pre-formatted tabs work much better in proportional fonts, following the CSS 2.1 spec.
• The ime-mode property is supported.
• The CSS text-rendering property for HTML is now supported bug 387969 ).
• -moz-border-*-start and -moz-border-*-end CSS properties are implemented bug 74880 ).
• -moz-initial is now implemented for almost all CSS properties (except quotes and -moz-border-*-colors) bug 80887 .
• window.getComputedStyle() now supports all supported CSS properties bug 316981 ).
• content ’s none value is now supported bug 378535 ).
• cursor ’s none value is now supported bug 346690 ).
• Background images now properly clip to a -moz-border-radius bug 24998 ).
• white-space ’s pre-wrap value is now supported bug 261081 ).
• Selectors like :first-child, :only-child, :last-child bug 73586 ), :empty bug 98997 ), or the + combinator bug 229915 ) are now updated dynamically bug 401291 ).
• Negative z-index values are supported correctly.

Source:

• Mozilla Developer Center - CSS improvements in Firefox 3