Mozilla has finally released what’s set to be the final beta before Firefox 3.5. Firefox 3.5 beta 4 was made available late last night. It’s the first release under the newly assigned 3.5 label.

Firefox 3.5 Beta 4: What’s New

Despite the impressive number jump, Firefox 3.5 Beta 4 is just a stepping stone up in the beta development chain. The release incorporates a handful of fixes and improvements from its predecessor, Firefox 3.1 Beta 3, including better private browsing functionality and a more stable build of the TraceMonkey JavaScript engine.

The new beta also adds support for geolocation-based location award browsing and native JSON. It’s said to feature faster content rendering as well.

Full release notes about the changes follow. Visit this page to download the release.

Firefox 3.5 Beta 4 is based on the Gecko 1.9.1 rendering platform, which has been under development for the past 10 months. 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 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