Latest Firefox build passes Acid2 test!
People are posting screenshots of Firefox development builds which pass the (in)famous Acid2 test from http://webstandards.org. The purpose of the test is to test for CSS2 support and error handling. Although Firefox releases have had full CSS2.1 support for some time, the way it handles malformed and invalid CSS was not completely straightened out until now.
These updates won't be included in official release builds until Firefox 3, but this is still great news!