Mozilla has just released an update for the Firefox Beta that updates the current version to 3.1b3 that will be last beta for the version 3.5.

Update brings support for HTML 5, W3C Geolocation API, JavaScript query selectors, and offline applications. HTML 5 is a big thing by W3C that supports some new exciting tags that allow you to put audio and video streaming using native html without requiring 3rd party plugins like Flash and Silverlight e.t.c. Here is the “What’s New” listing via Mozilla’s official website:

Firefox 3.1 Beta 3 is based on the Gecko 1.9.1 rendering platform, which has been under development for the past 9 months. Firefox 3.1 is an incremental release on the previous version with significant changes to improve web compatibility, performance, and ease of use:

• This beta is now available in 64 languages - get your local version.
• Improved the new Private Browsing Mode.
• Improvements to web worker thread support.
• Improved performance and stability with the new TraceMonkey JavaScript engine.
• New native JSON support.
• Improvements to the Gecko layout engine, including speculative parsing for faster content rendering.
• Support for new web technologies such as the <video> and <audio> elements, the W3C Geolocation API, JavaScript query selectors, CSS 2.1 and 3 properties, SVG transforms and offline applications.

Developers can find out about all the changes and new features at the Mozilla Developer Center.

You can download the Beta here