User-facing changes

• Aero Glass is now enabled for Windows Vista and Windows 7.
• More parts of the new Windows theme have landed including new main button icons. Many more changes are coming in later releases.
• The new Add-ons manager has landed. The UI for the new Add-ons manager is not yet complete.
• You can now put tabs on top (View -> Toolbars -> Tabs on Top) although without most of the final UI this isn’t as useful as it could be.

Web-facing changes

• Support for WebM is included with this build. (Try an example video on Youtube.)
• When viewing HTML5 videos in full screen, we now use hardware acceleration for Windows (DX9) and Macs (OpenGL).
• This is the first release of any browser that has proper support for parsing HTML5 according to the specification.
• This build has early support for some HTML5 forms.
• We now support the FormData interface, part of XHR level 2 spec.
• We now support a Mozilla-specific CSS selector: -moz-any. Please see the post for examples, but this will be very useful in HTML5 contexts.
• We now do Lazy Frame Construction which can vastly improve the performance of complex pages that add large numbers of elements to a page.
• Lots of new JavaScript performance improvements have been made.

Platform Changes

• An updated about:memory page shows you how memory is being consumed in the browser. This will improve with later updates to give even more useful data and cover more internal memory pools.
• On the Mac we now support the Cocoa event model for NPAPI plugins. This is used by Flash 10.1 and the new Java plugin from Apple.
• ChromeWorkers with jscytpes is now supported.