SeaMonkey 2.10

* The new minimum supported Windows version is now XP SP2, Windows 2000 support has been dropped
* The domain name is highlighted in the location bar by default now, configurable in Preferences
* The amount of tabs to be restored concurrently can be configured in Preferences now
* News username and password auth dialogs have been combined and show for which server the prompt is now
* The SPDY protocol now enabled by default for faster browsing on supported site
* 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 <form> element
* The CSS turn unit is now supported
* Fixed several stability issues