Thanks to this new graphics infrastructure, boxes with corners rounded by the pre-CSS 3 property
border-radius are rendered with beautiful anti-aliasing (currently accessible as the non-standard
-moz-border-radius and soon
-webkit-border-radius). Stated more simply, rounded boxes are prettier.
Here’s a quick comparison of a box with CSS rounded-corners rendered in Firefox 3.0 Alpha 1 versus Firefox 2.0:
The difference is subtle, especially with lighter colours like these, but this example represents a significant improvement in the abilities and quality of rendering in Firefox.
Also note that Firefox 3 probably won’t be released until the second half of 2007 (that’s not based on anything official - just a guess).