Firefox 3.5 beta 4 coming soon

Mozilla is inching closer to the release of Firefox 3.5, which includes a faster Javascript engine, a private browsing mode, faster page rendering, and changes to the way tabs are handled. Firefox 3.5 beta 4 is due to be released within the next week or so.
If you're not ready to test out pre-release software yet, Mozilla should be releasing Firefox 3.0.9 next week as well. That version will likely offer bug fixes and security updates but no major new features.
Or if you want to live on the bleeding edge, you can always try the early builds of Firefox 3.6, also referred to as Firefox.Next. Goals for that version include faster startup times, improved add-on and customization support, and blurring the distinction between desktop and web apps. You can download the latest nightly builds of Firefox.Next from Mozilla's FTP site.

Firefox 3.5 beta 4 coming soon