Mozilla has released the fourth beta for Firefox 4.0 on August 24th. This release is being made available for testing purposes only, and is intended as a preview release for web application developers and the testing community.

New stuff in this release:

• Firefox Sync is now included by default.
• A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped.
• An experimental API is included to provide more efficient Javascript animations.
• Firefox now supports the HTML5 video “buffered” property.
• See the complete changelist from the previous beta.

For more info see the release notes for Firefox 4 Beta 4. Next up is going to Beta 5 is due out in September.

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