The fifth version of the browser will receive a new interface, where users can resize the tabs at the same time keep open two or more tabs. Another innovation - is the disappearance of the buttons Home, which can be moved into tabs or browser application. However, the report says that the question is still open to home.
Also, the browser will have a new address bar is designed to work with social networks Facebook and Twitter, as well as social sites Reddit, Digg and StumbleUpon. The next innovation Firefox 5 will be fully customizable menu of your browser, some of the items which you can make in the form of labels. 
Finally, in Firefox 5 will update the data management system users, which allows the user to create multiple profiles and decide which one to pass at this time.
Mozilla. announced the availability of testing beta builds Firefox browser, 5, submitted by developers in two versions - for desktop and handheld devices running Android.
It is reported. That members of the project focused its efforts on supporting browsers modern web standards, optimize the speed of the product, enhancing the stability of operation and safety. Of the characteristic features of the desktop version of Firefox 5, the support for CSS- animation, enhanced JavaScript- engine, better integration with user environments Linux-based platforms, as well as the opportunity to upgrade to a browser experimental branches. It is expected that by the time of release of the final assembly of the program in the fifth version of Firefox developed system will manage accounts, built-in PDF- reader and a modified interface. In addition, we plan to make the official release for 64-bit versions of Windows.