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Mozilla has finally released a Release Candidate version of Firefox 4. Hopefully we will soon have the final version of Firefox 4 unless there is no more Release Candidate (RC 2) version before the final release. Firefox 4 RC 2 is considered to be stable and safe to use for daily web browsing, though the features and content may change before the final product release. At this time many Add-ons may not yet have been tested by their authors to ensure that they are compatible with this release. If you wish to help test Add-on compatibility, please install the Add-on Compatibility Reporter – your favorite Add-on author will appreciate it!

What Firefox 4 RC 2 is All about:

• Firefox 4 RC 2 is available in 79 languages
• Support for the proposed Do Not Track (“DNT”) header
• Connection status messages are now shown in a small overlay
• WebGL is enabled on all platforms, but, like for other hardware acceleration features, many buggy drivers or driver versions are blocked
• The default homepage design has been refreshed
• Firefox no longer switches into offline mode automatically
• Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
• Per-compartment garbage collection is now enabled, reducing work done during complex animations
• The Firefox Sync setup experience has been greatly improved across desktop and mobile devices
• Additional polish for the Firefox Add-ons Manager
• Uses JägerMonkey, a new, faster JavaScript engine
• Certain rendering operations are now hardware-accelerated using 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
• HTML5 Forms API makes web based forms easier to implement and validate
• Support for the new proposed Audio Data API
• Direct2D Hardware Acceleration is now on by default for Windows 7 users
• Firefox button has a new look for Windows Vista and Windows 7 users
• Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
• Firefox Sync is now included by default
• A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped. etc. free download softwares.

Download : Mozilla Firefox 4 RC 2