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photobucketFirefox 3.5 beta 4 is now available for download, the last beta before the final version of Firefox 3.5 is out.

Private browsing is one of those long-sought features that everyone else has, and although Mozilla has been testing it for a while now, it’s one of the “big” features in the latest beta.

Besides private browsing mode, which lets you choose whether you want Firefox to retain possibly sensitive browsing data with one click, other new features compared to the 3.0.x Firefox branch include:


- Better performance and stability with the new TraceMonkey JavaScript engine.
- 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

You can download Firefox 3.5 beta 4 for Windows, Mac or Linux here.

If you’re not big on beta testing, you should know that the current stable, 3.0.x branch of Firefox has recently been updated to version 3.0.10, which brings several security and stability issues.