Mozilla has officially announced the availability of the second Firefox 3.1 alpha. This release includes support for the highly-anticipated HTML 5 "video" element and a handful of other features that move the browser forward.
Mozilla has been planning the 3.1 roadmap since before the launch of Firefox 3. Version 3.1 is expected to provide a strong incremental improvement and will include many of the features that were deferred for various reasons during the 3.0 development cycle. The developers are refining the user interface for tabs and tagging and are also working on on important backend improvements to boost compatibility with emerging web standards like CSS 3 and HTML 5.