FireFox 4 Beta

I started using it since a month ago, few things I like about this version

• Neat user interface - definitely a step up from 3.6, the whole application looks a lot cleaner, and blend into Windows 7 perfectly. But... does anyone feel it looks somehow familiar...?
• Good performance - from starting up the application to having a website displayed, all actions perform smoothly with FireFox4, even though my laptop is pretty old one.

As expected, many add-ons are still not yet updated for FireFox4, this shouldn't be a problem by the time of official release.

Apart from the interface change, there are no obvious new features added to FireFox4, I guess the more important update to the engine would be better support of HTML5 and CSS3.

When will FireFox going to have a sync bookmark tool built-in!!!!?!?!??!