Development work on Firefox 4 is going strong, beta 4 is expected to appear sometime next week.

• Firefox 4 Beta 3 is available in 34 languages.
• Web authors can now get touch events from Firefox users on Windows 7 machines.
• A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently.
• See the complete changelist from the previous beta.

You can download the full binary from Mozilla, existing Firefox 4 testers will get the update automatically (or manually by checking for updates from the Help menu).