Mozilla announced shortly after launch latest version de Firefox 3.1 - Beta 3. This is the fifth stage of development and third beta launched to meet new generation de Firefox browsers.
Firefox Beta 3.1 3 is a stable version brings improvements in Chapters private browsing, java, performance and stability. It looks like changes will be made to the tabs as well.
A number of add-on(and I do not think it will be too soon. It is scheduled for the final release only in the summer), but it is good to know that whoever wants to test this new version can install it with the final version by Firefox (3.0.7).
For more details and download, we recommend you visit the official version. Firefox Beta 3.1 3 - Release Notes & Download.