Mozilla has released Firefox 3.1 Alpha 2 the latest development version of the browser codenamed Shiretoko. The browser is based on Gecko 1.9.1 and has a better and faster JavaScript virtual machine.

Shiretoko Alpha 2 is an early developer milestone for the next version of Firefox that is being built on top of Mozilla’s Gecko 1.9.1 layout engine, Shiretoko Alpha 2 is being made available for testing purposes only, and is intended for web application developers and our testing community. Current users of Mozilla Firefox should not use Shiretoko Alpha 2.

Changes in this Development Milestone:

Shiretoko / Gecko 1.9.1 Alpha 2 introduces several new features:

• Support for the HTML 5 <video> element

• Initial support for web worker threads

• You can now drag and drop tabs between browser windows

• Ability to make use of Aero “Glass” in XUL

• Support for CSS 2.1 properties.

• Support for CSS 3 properties

• Performance improvements and new preference values for color management profile support