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Currently, the counter shows 5,755,000 downloads, most of which originated from Europe (2.5 million), followed by North America (1.6 million) and Asia (1 million).
In comparison, Microsoft's Internet Explorer 9 was downloaded 2.35 million times in its first 24 hours of availability.
The final version of Firefox 4 brings full CSS3 and HTML5 support, a redesigned UI, App Tabs, syncing accross multiple devices and Panorama, a feature that lets you organize tabs into groups using a drag and drop interface.