Firefox 13.0 Beta 1

# NEW
* When opening a new tab, users are now presented with their most visited pages
* The default home page now has quicker access to bookmarks, history, settings, and more
# CHANGED
* SPDY protocol now enabled by default for faster browsing on supported sites
* Restored background tabs are not loaded by default for faster startup
* Smooth scrolling is now enabled by default
# DEVELOPER
* 72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor
* The column-fill CSS property has been implemented
* Experimental support for ECMAScript 6 Map and Set objects has been implemented
* Support for the CSS3 background-position property extended syntax has been added
* The :invalid pseudo-class can now be applied to the element
* The CSS turn <angle> unit is now supported