Mozilla Firefox 4 Beta

Mozilla has launched the first beta of its Firefox 4 browser. Based on Gecko 2.0 Web platform layout engine, Firefox 4 Beta 1 is available for Windows, Mac OS X and Linux.
Firefox 4 Beta 1 includes dozens of major features and improvements :
* New Add-Ons Manager: gives you more space to manage your Add-Ons, Themes and Plugins. Customizing your browser has never been easier!
* HD Video: Watch hardware-accelerated, super-smooth, HD-quality HTML5 video on YouTube using the new WebM format.
* Privacy improvements: Mozilla always puts privacy first, and this latest beta fixes flaws in some Web standards that could expose your browser history.
* Crash Protection: Experience uninterrupted browsing (now available on all platforms) when a plugin crashes or freezes, you can resume browsing by simply refreshing the page.
* Performance: We know that performance is important. In this version, we focused on improving responsiveness at start-up and during page loads. This is just the beginning for performance improvements in Firefox 4.
The first beta of Firefox 4.0 mainly revamps the browser’s looks. Like for Windows users, Tabs have gone on top by default (like Chrome). Mac and Linux users are expected to get this feature as a default in subsequent betas. Another new feature for Windows users is the new orange 'Firefox' button on the top left. Click on it and it takes users to a drop-down filled with the most popular application menu items.