Latest Features Firefox 4 :
* Improvements in memory usage
* Support for blacklisting the graphics driver to increase stability
* See full list of changes from the previous beta
* Compatibility and stability improvements when using Adobe Flash on Mac OS X
Features from previous Firefox 4 :
* The stop and back buttons have been merged into one button on Windows, Mac OS X, and Linux
* It has been replaced by the Bookmarks Toolbar Bookmarks Button by default (you can switch back if you want)
* Crash protection for Windows, Linux, and Mac OS X when there are accidents in Adobe Flash, Apple Quicktime or Microsoft's Silverlight plugin
Transitional CSS
* Supported in part
* Full support is included WebGL
* Core Animation rendering model for plugin in Mac OS X. Plugin that also supports this model can now be interesting rendering faster and more efficient
* Native support for HD video formats HTML5 WebM
* Web developers can update the URL field without reloading the page using HTML API History
* Certain rendering operations now use hardware-accelerated Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7, and OpenGL on Mac OS X
* Improved Web typography using OpenType with support for ligatures, kerning and font variants
* Forms API HTML5 create web-based forms much easier to implement and validate
* Support for the proposed new Data API Audio
* Direct2D Hardware Acceleration is now enabled by default for Windows 7 users
* Button Firefox has a new look for Windows Vista and Windows 7 users
* Support for security protocols HSTS allows the site to insist that they will only be loaded on top of SSL
* Firefox is now included by default Sync
* A new feature gives users a visual overview of all open tabs, which allows them to be sorted and grouped
* An experimental API to provide more efficient including Animation JavaScript
* Firefox now supports video HTML5 "buffer" property
* Tabs are now on by default in Windows, Mac OS X, and Linux
* You can turn any tab into "App Tab" by right clicking and selecting "Set to App Tab" from the context menu
* Web developers can turn on the content using CSS Transitional
* Responsiveness and rolling improvement of the new coating system was detained layout
* JavaScript speed improvements due to optimization engine
* Changes to how XPCOM components listed to help the startup time and the separation process
* You can find and switch to the tab already open in the Smart Location Bar
* New Addons Manager and extension management API (UI will be changed before final release)
* Significant improvement of the API available to JS-ctypes, foreign function interface for extension
* More responsive page rendering using lazy frame construction
* History Link lookup done asynchronously to provide better response during pageload
* CSS: selectors visit has been changed to block sites from which the user can check your browsing history
* New HTML5 parser
* Support for a more control HTML5
* web authors can now get touch events from Firefox users on Windows 7 machine
* A new way represent the values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animation) is more efficient
* Firefox 4 Beta is available in 76 languages
* Overhaul of bookmarks and code history, enabling faster performance and startup bookmarks
* Per-compartment refuse collection is now activated, reduces the work done during complex animation
* Firefox Sync setup experience has been greatly enhanced through desktop and mobile devices
* Speed, functionality, and compatibility improvements WebGL
* Additional polish for Firefox Add-ons Manager
* Using JägerMonkey, the new, faster JavaScript engine
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