The Mozilla Foundation has announced the beta release of the world's most popular Web browser Firefox. Firefox is heading toward the next major update -- version 4.

The new update of Firefox 4 Beta is now available in 23 languages for testing and feedback. This update to Firefox 4 Beta continues with changes to the look of Firefox with tabs appearing on the top of the browser and introduces the ability to turn tabs into App Tabs.

Mac and Windows users now have all their tabs on the top of the browser. Firefox team has moved the tabs to the top to make it easier to focus on the Web content and easier to control the tools in your Web browser.

Major features include:
* Tabs are now on top by default on Windows and OSX - Linux will be changing when the theme has been modified to support the change.
* You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu.
* You can search for and switch to already open tabs in the Smart Location Bar
* The stop and reload buttons have been merged into a single button on Windows, Mac and Linux.
* The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like).
* Crash protection for Windows, Linux, and Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins.
* Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently.
* Native support for the HD HTML5 WebM video format.
* An experimental Direct2D rendering backend is available on Windows, turned off by default.

Download the beta here.

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