The beta also introduces native multitouch compatibility on Windows 7. This means that developers will be able to take advantage of the new multitouch API, which is expected to eventually filter down to users through add-ons.
On a note related to the ongoing development of the beta, some readers might have noticed that all of the options are missing from the Help sub-menu under the unified Firefox menu in the upper left corner of the interface. A Mozilla representative said that the developers are working on a fix for the bug, which includes the menu missing the "check for updates" option, the "About:" sub-menu that provides quick links to Firefox configuration menus such as "about:addons" and "about:config", and the "about:firefox" menu that provides current version data.
You can access it by forcing the menubar to appear under the Customize option. Users who only want to see their current version information can also type "about:" without the quotes to check which version of Firefox is currently being used.