Firefox released version 4.0 of its Browser. and so far 5,083,646 downloads.

Features

Better Speed

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Crash Protection

Hardware Acceleration

Private Browsing

Improved interface (Tabs on Top, All menu to one button, bookmark button)

App tabs you can pin tabs of frequently checking websites

Organize your Tabs with Panorama

Synchronization

Read more and download Firefox 4.0 Final