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This is a preview of Firefox 3.5, the upcoming version of the Firefox web browser.

It has not yet gone through a full set of quality assurance tests, and should not be considered as a release candidate. However, we appreciate your time and help in testing it by using it as your regular browser.

This is the first release candidate for Firefox 3.5, the latest version of the Firefox web browser. As a member of our beta audience, you are being updated to this version to help test and preview the new version before it is released to the general public. Please read below for more information.

Check out what’s new, the known issues and frequently asked questions about the latest version of Firefox. As always, you’re encouraged to tell us what you think, either using this feedback form or by filing a bug in Bugzilla.

What's New:

Firefox 3.5 (Release Candidate) is based on the Gecko 1.9.1 rendering platform, which has been under development for the past year. Firefox 3.5 offers many changes over the previous version, supporting new web technologies, improving performance and ease of use, and adding new features for users:

* This beta is now available in more than 70 languages - get your local version.
* Improved tools for controlling your private data, including a Private Browsing Mode.
* Better performance and stability with the new TraceMonkey JavaScript engine.
* The ability to provide Location Aware Browsing using web standards for geolocation.
* Support for native JSON, and web worker threads.
* Improvements to the Gecko layout engine, including speculative parsing for faster content rendering.
* Support for new web technologies such as: HTML5 <video> and <audio> elements, downloadable fonts and other new CSS properties, JavaScript query selectors, HTML5 offline data storage for applications, and SVG transforms.

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

Alternatively you can download the latest stable version of this software.