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Mozilla Firefox 3.1 Beta 3 has been released. This milestone is a public preview release intended for developer testing and community feedback. This milestone includes improvements to private browsing mode, and better performance and stability with a new Tracemonkey engine
Firefox 3.1 Beta 3 can be downloaded from the Firefox beta page. The Firefox 3.1 Beta 3 Release Notes have more details, including information about what’s new in Firefox 3.1 and what’s been improved in this specific milestone. The Mozilla Developer News weblog’s announcement of Firefox 3.1 Beta 3 includes more details of interest to developers.

Source: NEW MOZILLA 3.1 Beta