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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 3.5.2 Beta fixes the following issues:

* Several security and stability issues.
* Images with ICC profiles now render properly on all monitors.

Please see the complete list of changes in this version. You may also be interested in the Firefox 3.5 release notes for a list of changes in the previous version.

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.

Known Issues

This list covers some of the known problems with Firefox 3.5 which will be fixed in future updates or releases:

All Systems

* After installing this version, users will not be able to return to a previous beta version of Firefox 3.5 without creating a new profile (see bug 488966)
* Restoring your bookmarks from a backup can take some time, during which the browser may seem unresponsive (see bug 493731)
* After using Clear Recent History some SSL sites will not load all images and styles without pressing reload (see bug 480619)
* Firefox 3.5 will only support color profiles as specified by ICC v2, later versions will add support for ICC v4 (see bug 463221)
* Websites using the new downloadable font support that wish to change the color using :hover will also need to add text-rendering : optimizeLegibility for font sizes less than 20 pixels (see bug 495455)
* Some sites with Flash can cause problems with the Cookies dialog (see bug 495035)
* Web pages can no longer automatically install PKCS11 cryptographic tokens. Users are now required to do this manually or install an Add-on that installs them (see instructions and documentation)

Microsoft Windows

* Pressing enter in the Location Bar will not do anything if you are running AVG SafeSearch v8.0 or lower. Upgrading AVG SafeSearch fixes the problem (see bug 479095)
* If you select Fax from the Print Dialog, the Windows Fax dialog will appear and then disappear. Faxing still works from other applications (see bug 440486)

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.